FILE 617 / 31 July 2025 / 176 MIN / full

Murder Mystery Gone Wild

Payson, UtahListen

The town

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

This is Payson, Utah ... this is in Utah County, north central Utah, about 20 minutes to Provo about 0:05:09

History, in brief

1850

Mormons were the first to settle the area; Edward Pace Jr. was the first settler, arriving in 1850 with his family and the families of two others, 16 people in all, at Peteetneet Creek.

about 0:06:23

Town note

The settlement was originally named Peteetneet Creek after Chief Peteetneet.

about 0:06:57

1853

In January 1853 territorial governor Brigham Young submitted a bill to the second Utah Territorial Legislature to incorporate Payson as a city, and the act passed.

about 0:07:09
All 9 history facts

1850

Mormons were the first to settle the area; Edward Pace Jr. was the first settler, arriving in 1850 with his family and the families of two others, 16 people in all, at Peteetneet Creek.

about 0:06:23

Town note

The settlement was originally named Peteetneet Creek after Chief Peteetneet.

about 0:06:57

1853

In January 1853 territorial governor Brigham Young submitted a bill to the second Utah Territorial Legislature to incorporate Payson as a city, and the act passed.

about 0:07:09

Town note

In the late 1800s a factory making horse collars operated in Payson.

about 0:08:08

1912

The Strawberry Valley reclamation project was completed in 1912 and the Utah Idaho Sugar Company placed a sugar beet processing factory in the area.

about 0:08:16

1897

In 1897 the beet leafhopper ate the sugar beets and destroyed the crop, so farmers reduced sugar beets and planted other crops; the site is now a fertiliser factory.

about 0:08:30

1929

The onion celebration was first held in 1929 as an opportunity for residents and former residents to renew friendships, originally called the onion harvest and homecoming, honouring Payson's status as an agricultural district and outstanding producer of onions.

about 0:17:24

Town note

The event was renamed Payson City Golden Onion Days and is held every year on Labor Day weekend.

about 0:17:51

The figures, as told

Religious

95.7%

Biggest faith: Mormon residents, 93.3%

about 0:11:34

Who lives here

White 84.1% · Black 0.1% · Asian 0.3% · Hispanic 13.5%

Ethnicity can overlap race.

Crime / national average

Property crime
right about average

about 0:22:43

Violent crime
▼ less than half

about 0:22:52

Money

Median home value$425,000
Two-bedroom rent$1,130
Median household income$75,682
Cost of living117

For sale

$312,000

Three-bedroom, two-bath manufactured home, about 1,250 square feet

about 0:15:09
All figures and comparisons, as told in 2025

Property crime

"right about average"

Comparison: "the United States". Direction: about the same.

As told in 2025 about 0:22:43

Violent crime

"less than half"

Comparison: "the national average". Direction: below.

As told in 2025 about 0:22:52

Population

"21,093"

No direction stated.

As told in 2025 about 0:10:18

Men

"about 51.5%"

No direction stated.

As told in 2025 about 0:10:33

Median age

"26.7"

Comparison: "usually 38 in the rest of the country". No direction stated.

As told in 2025 about 0:10:47

Married residents

"56%"

Comparison: "above the average". Direction: above.

As told in 2025 about 0:10:56

Married with children

"53.2%"

Comparison: "very high". Direction: above.

As told in 2025 about 0:11:03

White residents

"84.1%"

No direction stated.

As told in 2025 about 0:11:11

Black residents

"0.1%"

No direction stated.

As told in 2025 about 0:11:11

Asian residents

"0.3%"

No direction stated.

As told in 2025 about 0:11:11

Hispanic residents

"13.5%"

No direction stated.

As told in 2025 about 0:11:11

Religious residents

"95.7%"

Comparison: "50-50 is the normal national average". Direction: above.

As told in 2025 about 0:11:34

Mormon residents

"93.3%"

No direction stated.

As told in 2025 about 0:12:30

Median household income

"$75,682"

Comparison: "slightly above the national average". Direction: above.

As told in 2025 about 0:12:51

Cost of living index

"117"

Comparison: "100 is the average in the rest of the country". Direction: above.

As told in 2025 about 0:13:07

Median home cost

"$425,000"

No direction stated.

As told in 2025 about 0:13:15

Average two-bedroom rent

"$1,130"

Comparison: "below the national average". Direction: below.

As told in 2025 about 0:13:53

10-foot wide single-wide trailer, 910 square feet

"$110,000"

No direction stated.

As told in 2025 about 0:14:31

Three-bedroom, two-bath manufactured home, about 1,250 square feet

"$312,000"

No direction stated.

As told in 2025 about 0:15:09

Nine-bedroom, seven-bath home, 8,504 square feet

"$2,999,900"

No direction stated.

As told in 2025 about 0:15:50

The reviews

3.3 / 5 · average of 3

5 stars

“I have lived in and near Payson my whole life and it is my home; the people are fun and the surrounding areas make it a great place to raise a family and be with friends.”
about 0:08:57

3 stars

“The city struggles to keep up on street repair, there are not enough traffic lights for the number of people, businesses struggle to stay and the planning is poor.”
about 0:09:15

2 stars

“The attitude around the city is that it has been a crappy little town forever and there is no reason to get better at anything.”
about 0:10:00

In Utah

Closest episodes

  1. The Bad SeedEureka, Utah · 24 June 202333 km / 21 miShow on map
  2. Dr Serial KillerPleasant Grove, Utah · 26 September 202437 km / 23 miShow on map
  3. Starting Your Own Religion Can Be TrickyAmerican Fork, Utah · 9 April 202038 km / 24 miShow on map
  4. The Lego MurdersHolladay, Utah · 17 September 202070 km / 44 miShow on map
  5. Master Of DeceitSouth Salt Lake, Utah · 3 January 202676 km / 47 miShow on map

The story

Dr. K. Sherman Mortenson was born on 6 July 1939 in Ephraim, Utah, the oldest of five children, and grew up on a farm raising sheep with his father. He married Hermona Anderson and they had four children, Roger K., Julie Janet and Paul. Mortenson collected degrees from Snow College, Utah State University and the University of Utah, took a PhD in metallurgy and joined Brigham Young University in 1968, teaching manufacturing design, engineering technology and mechanical engineering for more than thirty years until he left in 2005. He was widely respected by colleagues and students. He and Hermona later divorced, and in retirement he married Darla Pectol Jones, a bright, sociable woman with grown children of her own.

Mortenson was also a survivalist. He believed nuclear war, civil war, pandemics and economic collapse were coming, and he built himself a fortress in Payson: around a hundred guns kept in strategic positions all over the house, a separate underground bunker stocked with weapons, ammunition, tinned food and water, and a black belt in karate. He was frugal apart from guns and preparations, invested well enough to be worth millions by the early 2000s, and put his money in a trust for his children. He told his sister Fern that if society collapsed and her family came hungry to his door he would probably shoot her, because he did not have enough for everybody.

His eldest son Roger had a different life. He served in the Navy and worked for the state of Utah, then in 1994 he was in an all-terrain vehicle accident that left him with a brain injury. Afterwards he could not hold a job, began using drugs and became combative. He lived on disability, less than a mile from his father, and the two men were constant companions.

On 16 November 2009 Mortenson's wife Darla was in Salt Lake County with her daughter, who was having a baby. Mortenson stayed home. At 8.52 that evening Roger Mortenson called 911, with his wife Pamela, known as Pam, beside him, and said armed men had tied them up. The call was confused and contradictory. Police found K. Sherman Mortenson in an upstairs bathroom, kneeling over the bath with his throat cut at least five times and a stab wound to the back of his neck. The medical examiner said the wounds would have taken one to five minutes to kill him. There was no forced entry. Drawers and gun lockers were untouched, but guns were missing, including weapons from the hidden bunker, while valuable collector pieces had been left behind. Seasoned raw meat sat on a countertop grill.

Roger and Pam said they had come with a pecan pie for game night, found an unfamiliar car, been let in by a stranger, then held at gunpoint and bound with zip ties at wrists and ankles. Roger said he began to pray aloud and the intruders bowed their heads, then changed their minds and let them live on condition that they told police three black men had broken in. They said the men took Roger's driving licence, read out his address and threatened to kill them if they deviated from the script.

Detectives grew suspicious. The couple seemed composed. Their accounts changed repeatedly, including the number and race of the attackers and whether Pam saw blue fuzzy gloves or purple ones. They showed no marks from the zip ties. They were deeply in debt and Roger stood to inherit a third of his father's millions. In January 2010 police named them persons of interest, and both failed polygraph tests. Pam was offered a deal to testify against Roger and refused.

In early December 2010 an anonymous tip led investigators to a house in Vernal, where they found Mortenson's stolen guns. Twenty of the guns were recovered, fourteen of them buried, some in a septic tank at Vernal Park.

Mortenson is buried in Ephraim State Cemetery in San Pete County, Utah, in plot H365.

The case

Murder of K. Sherman Mortenson

Victims

K. Sherman Mortenson (70). retired BYU professor of technology, metallurgist and survivalist

Accused and outcomes

As told in the episode, on 31 July 2025.

Accused

Accused

Outcome

Other people

Darla Pectol Jones Mortenson. Mortenson's widow, in Salt Lake County with her daughter when he was killed
Hermona Mortenson. Mortenson's first wife and mother of his four children
Fern. Mortenson's younger sister
Janet. Mortenson's daughter, killed in a car accident in Salt Lake City in 1988
Rachel Bingham. ex-wife, whose tip to police broke the case
Peter Smith. Rachel Bingham's boyfriend, who urged her to go to the police
William Robert Lemieux. co-defendant of Roger Mortenson, given 36 months' probation for an unregistered machine gun
Kent Carroll. longtime neighbour of Mortenson
Lieutenant Mike Browser. sheriff's department first responder

The timeline

  1. July 6th, 1939 K. Sherman Mortenson is born in Ephraim, Utahabout 0:24:17
  2. about 1962 Roger K. Mortenson, his first child, is bornabout 0:26:03
  3. 1968 Mortenson joins the faculty at Brigham Young University (Brigham Young University)about 0:45:46
  4. 1972 A newspaper reports Mortenson and two students are in Detroit for a national clean air vehicle competitionabout 0:32:34
  5. December 13th, 1984 The Herald reports Mortenson on a BYU panel about the possible closure of the Geneva steel works (Orem Geneva Works)about 0:34:11
  6. 1988 His daughter Janet is killed in a car accident in Salt Lake Cityabout 0:35:51
  7. 1994 Roger is in an all-terrain vehicle accident and suffers a brain injuryabout 0:37:21
  8. 1996 Roger pulls a handgun on a car full of Boy Scouts in American Fork Canyon (American Fork Canyon)about 0:38:00
  9. 2002 His stepson beats Roger in the head with a baseball bat, requiring metal platesabout 0:43:25
  10. 2005 Mortenson leaves Brigham Young University after more than 30 years (Brigham Young University)about 0:45:46
  11. early November 2009 Mortenson finishes an 18-month mission for the LDS church at the Provo mission (Provo mission)about 1:04:25
  12. November 16th, 2009 Darla is in Salt Lake County with her daughter, who is having a babyabout 1:05:02
  13. November 16th, 2009, 8.52 p.m. Roger Mortenson calls 911 and says armed men tied them up (Mortenson house)about 1:05:45
  14. November 16th, 2009 Police find Mortenson kneeling over the bath with his throat cut and a stab wound to the back of his neck (Upstairs bathroom)about 1:09:50
  15. November 19th, 2009 Online comments about the case appear, including claims about Mortenson shooting a neighbour's dogabout 1:24:44
  16. November 25th, 2009 The family offers a $25,000 rewardabout 1:34:04
  17. January 25th, 2010 Police publicly name Roger and Pam as persons of interestabout 1:34:44
  18. early March 2010 Police release a list of firearms stolen from Mortensonabout 1:35:26
  19. 2013 The case is covered by On the Case with Paula Zahn as Bound by Truth and by Dateline as Murder at Payson Canyonabout 2:43:09
  20. 2021 Trace of Evil airs The Perplexing Case of K. Mortensonabout 2:43:47

Places and phrases

N ↑Public placePublic placePublic placePublic placeTown centre (approximate places)
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