FILE 535 / 10 October 2024 / 168 MIN / full

Murder Bones Mystery

Seiling, OklahomaListen

The town

N ↑Public placePublic placePublic placePublic placeTown centre (approximate places)
Static locations; no street basemap. Places and details. OpenFreeMap © OpenMapTiles Data from OpenStreetMap.

Sealing, Oklahoma, in Dewey County, the crossroads of northwest Oklahoma about 0:06:23

History, in brief

Town note

Developed as an agricultural centre and became the largest town in Dewey County even though the railroad did not come; the railroad went to Canton, more than 25 miles away.

about 0:06:42

1906

There were no bridges across either of the Canadian rivers until 1906.

about 0:07:02

1903

A horse racing track was built in 1903, before the bridges.

about 0:07:21

Town note

Lands assigned to the Choctaw and Seminole tribes extended into the area now occupied by Dewey County.

about 0:07:38
All 13 history facts

Town note

Developed as an agricultural centre and became the largest town in Dewey County even though the railroad did not come; the railroad went to Canton, more than 25 miles away.

about 0:06:42

1906

There were no bridges across either of the Canadian rivers until 1906.

about 0:07:02

1903

A horse racing track was built in 1903, before the bridges.

about 0:07:21

Town note

Lands assigned to the Choctaw and Seminole tribes extended into the area now occupied by Dewey County.

about 0:07:38

1866

Under the Reconstruction Treaties of 1866 the Choctaw and Chickasaw ceded their western domain to the United States.

about 0:07:46

Town note

The area was known as the Leased District, and part of it became the Cheyenne and Arapaho reservation.

about 0:07:55

1891

Dewey County was created in Oklahoma Territory in 1891 and opened to non-Indian settlement on April 19th, 1892.

about 0:08:08

Town note

It was named County D by an act of Congress and did not receive its present name until residents voted on it years later.

about 0:08:23

Town note

Farms were heavy producers of cotton and broomcorn.

about 0:08:50

Town note

There was a cotton gin and a feed mill in the early years.

about 0:09:14

Town note

Wheat and rye became important; after the First World War the Fred Sander Flour Mill opened and made White Rose Special Flour.

about 0:09:21

Town note

The milling company is listed in the National Register of Historic Places.

about 0:09:32

1920

After the war agriculture declined and by 1920 many people left, yet the population rose from 1920 to 1930 during the dust bowl years.

about 0:09:49

The figures, as told

Religious

80.7%

Biggest faith: Other Christian faiths, 37.7%

about 0:13:12

Who lives here

White 63.9% · Black 0.0% · Asian 0.5% · Hispanic 18.9%

Ethnicity can overlap race.

Crime / national average

Property crime
▼ about one third below

about 0:24:59

Violent crime
▼ about one third

about 0:25:06

Money

Median home value$123,800
Two-bedroom rentabout $810
Median household income$45,368 a year

For sale

50 grand

Three-bedroom, four-bath, 1,672 square foot house

about 0:15:55

For sale

$99,000

Four-bedroom, two-bath, 2,240 square foot mobile home

about 0:16:50

For sale

$299,000

Four-bedroom, three-bath, 2,280 square foot house on 17.46 acres

about 0:17:36
All figures and comparisons, as told in 2024

Female share of the population

"63.3%"

No direction stated.

As told in 2024 about 0:11:24

Median age

"about 35 and a half"

Direction: below.

As told in 2024 about 0:12:34

Married

"about 50-50"

Comparison: "usual statistics". No direction stated.

As told in 2024 about 0:12:50

Native American

"1.3%"

No direction stated.

As told in 2024 about 0:13:01

Religious

"80.7%"

Comparison: "the only higher figure seen was in Utah". Direction: above.

As told in 2024 about 0:13:12

Other Christian faiths

"37.7%"

No direction stated.

As told in 2024 about 0:13:33

Median household income

"$45,368 a year"

Comparison: "national average, about 20,000 to 25,000 less". No direction stated.

As told in 2024 about 0:13:50

Median home cost

"$123,800"

No direction stated.

As told in 2024 about 0:14:07

Average two-bedroom rent

"about $810"

Comparison: "national average". No direction stated.

As told in 2024 about 0:14:53

Three-bedroom, four-bath, 1,672 square foot house

"50 grand"

No direction stated.

As told in 2024 about 0:15:55

Four-bedroom, two-bath, 2,240 square foot mobile home

"$99,000"

No direction stated.

As told in 2024 about 0:16:50

Four-bedroom, three-bath, 2,280 square foot house on 17.46 acres

"$299,000"

No direction stated.

As told in 2024 about 0:17:36

Property crime

"about one third below"

Comparison: "national average". Direction: below.

As told in 2024 about 0:24:59

Violent crime

"about one third"

Comparison: "national average". Direction: below.

As told in 2024 about 0:25:06

The reviews

5.0 / 5 · average of 1

5 stars

“One of the most amazing places; the reviewer has witnessed first hand what the town does for people and how everyone comes together in a time of need for friends and families.”
about 0:10:35

In Oklahoma

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The story

He met Janet, who was born in 1952, and they married on Christmas Eve 1974. Janet worked as a school nurse at John Marshall High School. Seiling residents regarded him as a fence thief who kept to himself; Oklahoma City neighbours thought him a devoted father and a helpful neighbour.

The marriage ended on July 25th, 1990. She began seeing Jim Umbenhauer, a serviceman, and by December had a social life again. On Friday December 7th, 1990, she had dinner with the children and they decorated the house for Christmas. Tad, Todd and Julie went to bed about 9.30 that night; Janet stayed up.

On the morning of Saturday December 8th Tad woke for a wrestling match, heard his mother's alarm, and found her bed made with the pillows under the blankets, her toiletries gone from the vanity and her 1989 Chevrolet Blazer gone from the garage. He waited half an hour, then telephoned his father at the ranch. She never came back. By nightfall the family called the Oklahoma City police, who suggested she would probably return over the weekend and told them to call again on Monday.

On Monday the police began interviewing her friends and family, and searched the house without finding blood, a body or any sign of a struggle. Her purse, car and toiletries were gone, and her calendar was full of plans for the coming week, including a friend's birthday party, which convinced everyone she had not left voluntarily. She was five feet seven inches tall, 157 pounds, with brown hair, brown eyes and dark-rimmed glasses. Her father, Arthur Olsen, said she would never abandon the children and told police about the new boyfriend. Her cousin Tina Bloomer said the family knew something had happened.

Janet's Blazer was found in the parking lot at Will Rogers Airport with its boot full of toys, apparently Christmas presents. While detectives examined it, Umbenhauer drove up, although the discovery had not been made public. He said he had been driving around car parks looking for her car. He had also obtained a key from her father after she vanished and searched her house alone, explaining that he wanted to retrieve love letters to keep their relationship private; he handed the police a box of letters. He admitted frequently staying overnight and giving her a ring, but lied about another woman he was living with. He failed a polygraph after a six-hour interview, then passed a second one and was cleared.

His first polygraph was inconclusive and he refused another, citing heart problems. A witness said his truck was outside Janet's house at about seven that evening, and another said she helped him pack Janet's clothes into boxes on the Monday and put them in the attic. Two months later a neighbour corrected her account of a large fire on the ranch: it had been the morning after Janet disappeared, not the day before, with black smoke and flames 30 to 40 feet above the trees. On January 14th, 1991, after a two-month search, Undersheriff Jerry Jones found burned bone fragments in four burn piles of cedar about a quarter mile south-east of the ranch house. Four teeth and a five-inch piece of gold chain, the sort of necklace Janet always wore, were with them. Dental records identified her.

The children were taken from school into state care; Tad ran away for a day, and a juvenile court gave temporary custody to the great aunt Mary Bloomer. His attorney, Ervin Box, said he denied any knowledge of the death or of how the bones came to be on his ranch. Prosecutors alleged he had crept into the house, abducted Janet, left her at a house he owned nearby, drove her car to the airport, took a taxi back for his own car and then killed her at the ranch with a blow to the head before burning the body, though no blood or struggle was ever found anywhere. The remains were examined by the anthropologist Clyde Snow, who reconstructed a charred skull and found an indentation at the back with signs of bleeding, suggesting a blow before burning. No cause of death could be established.

Tad, then 13, testified in tears that his father had told them the bones were a possum and that he and Todd had thrown them at each other, and identified his mother's necklace in a photograph.

The case

Murder of Janet Dennis

Victims

Janet Dennis. born 1952; school nurse at John Marshall High School in Oklahoma City; mother of three

Accused and outcomes

As told in the episode, on 10 October 2024.

Accused

Outcome

Other people

Tad Dennis. her 12-year-old son, who found her missing and testified about playing with the bones
Todd Dennis. her son, a toddler at the time
Julie Dennis. her young daughter
Masil Dennis. mother, who gave him an alibi
Jerry Jones. Dewey County undersheriff who searched the ranch
Ervin Box. defence attorney
Robert Macy. Oklahoma County district attorney
Fern Smith. assistant district attorney
Clyde Snow. forensic anthropologist who reconstructed the skull
Denise Lynn Thomas. 16-year-old neighbour who testified she saw truck
Arthur Olsen. Janet's father
Tina Bloomer. Janet's cousin
Mary Bloomer. maternal great aunt given temporary custody of the children
Kenneth Turner. Amber Dewer's attorney

The timeline

  1. about 1941 Dennis's family buys a 1,500 acre ranch at Seiling (Dennis ranch)about 0:26:27
  2. April 1948 is bornabout 0:25:49
  3. 1952 Janet is bornabout 0:27:00
  4. Christmas Eve 1974 and Janet marryabout 0:27:05
  5. 1978 Son Tad is bornabout 0:27:50
  6. 1978 serves as director of safety services for the Oklahoma County Red Crossabout 0:40:17
  7. 1986 Daughter Julie is bornabout 0:43:09
  8. March 1988 Janet's great aunt Mabel Gerard, 86, dies and leaves her estate in a trust with as trusteeabout 1:51:34
  9. March 1989 Interest checks from the trust begin being cashed around the stateabout 1:53:40
  10. July 25, 1990 Their divorce is final; Janet gets custody, the house, a car, half the ranch and $30,000about 0:45:15
  11. August 3, 1990 A $65,379.26 cheque payable to Amber Dewer is endorsed by , who that day buys a $65,000 certificate of deposit in Todd's name (First National Bank in Seiling)about 1:50:13
  12. December 7, 1990, about 3 pm A 16-year-old neighbour sees truck in Janet's driveway, and again at 4, 7 and 8.30 pm (Janet Dennis house)about 2:17:42
  13. December 7, 1990, evening Janet has dinner with the children and they decorate the house for Christmas (Janet Dennis house)about 0:48:47
  14. December 7, 1990, about 9.30 pm Tad, Todd and Julie go to bed (Janet Dennis house)about 0:50:03
  15. December 8, 1990, morning Tad wakes for a wrestling match, finds his mother gone, her bed made, her toiletries and car missing (Janet Dennis house)about 0:50:41
  16. December 8, 1990, morning A neighbour sees a large fire with black smoke and flames 30 to 40 feet above the tree line on ranch (Dennis ranch)about 1:16:15
  17. December 8, 1990 Tad calls at the ranch; says he will come later that morning and asks friends to sit with the children (Dennis ranch)about 0:53:43
  18. December 8 or 9, 1990 The family calls Oklahoma City police, who say she will probably be back after the weekend (Oklahoma City Police Department)about 0:54:56
  19. December 10, 1990 A woman helps pack Janet's clothing into boxes, which are later put in the attic (Janet Dennis house)about 1:14:10
  20. December 10, 1990 With Janet still missing, police take the case seriously and interview at the house (Janet Dennis house)about 0:55:42
  21. December 1990 Janet's Blazer is found in the long-term parking lot at Will Rogers Airport, its trunk full of toys (Will Rogers Airport)about 1:03:15
  22. December 1990 Jim Umbenhauer turns up at the airport while police are examining the car and hands over a box of love letters (Will Rogers Airport)about 1:04:40
  23. December 1990 Umbenhauer fails a polygraph after a six-hour interview; police learn he had been living with another woman (Oklahoma City Police Department)about 1:19:09
  24. December 1990 takes a polygraph; the result is inconclusive and he refuses a second testabout 1:12:16
  25. December 1990 Umbenhauer takes a second polygraph and passes it; police clear himabout 1:25:23
  26. January 14, 1991 Investigators find burned human bone fragments in burned cedar piles about a quarter mile from the ranch house (Burn site on the Dennis ranch)about 1:27:55
  27. January 1991 Four teeth and a five-inch piece of gold chain are found; dental records identify Janet (Burn site on the Dennis ranch)about 1:29:48

Last meals

  • Janet Dennis. dinner with her three children the evening before she disappeared, December 7th, 1990about 0:48:47

Places and phrases

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Static locations; no street basemap. Places and details. OpenFreeMap © OpenMapTiles Data from OpenStreetMap.

Places in the story

Public places are marked on the map.

Heard in this episode