FILE 717 / 16 July 2026 / 183 MIN / full

Marriage, Murder, Malice & The Mob

Palos Park, IllinoisListen

The town

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

we're going to Palos Park, Illinois about 0:06:01

History, in brief

Town note

Early settlers built log houses and cut timber, loading it on canal barges for Chicago's construction and fuel.

about 0:07:15

Town note

There were farms and cattle, chickens, pigs and goats in the area.

about 0:07:39

1848

The I&M Canal came in 1848 and brought Irish and German immigrants to work on it.

about 0:07:46

Town note

Early settlers were farmers, labourers, blacksmiths and wood cutters.

about 0:07:58
All 9 history facts

Town note

Early settlers built log houses and cut timber, loading it on canal barges for Chicago's construction and fuel.

about 0:07:15

Town note

There were farms and cattle, chickens, pigs and goats in the area.

about 0:07:39

1848

The I&M Canal came in 1848 and brought Irish and German immigrants to work on it.

about 0:07:46

Town note

Early settlers were farmers, labourers, blacksmiths and wood cutters.

about 0:07:58

Town note

In the 1850s Palos Township was named Trenton, like New Jersey, but the first postmaster changed it to Palos.

about 0:07:58

1914

The village felt the need for local government around 1914 and incorporated.

about 0:08:32

Town note

A village aid plan called for new roads, electricity, indoor plumbing and telephones.

about 0:08:40

Town note

A law required one-acre residential lots to stop houses being built on top of each other.

about 0:08:58

Town note

Industrial and business development was limited to the railroad site.

about 0:09:25

The figures, as told

Religious

60%

Biggest faith: Catholic, 38.7%

about 0:12:45

Who lives here

White 85.9% · Black 0.9% · Asian 1.1% · Hispanic 10.8%

Ethnicity can overlap race.

Crime / national average

Property crime
▼ about a third of the national average

about 0:20:23

Violent crime
▼ less than one quarter of the average

about 0:20:30

Money

Median home value$428,200
Two-bedroom rent$2,140
Median household income$122,676
Cost of living105

For sale

$320,000

Two-bedroom, two-bath condo asking price

about 0:15:02

For sale

$499,900

Three-bedroom, three-bath house asking price

about 0:15:23

For sale

$2,399,000

Five-bedroom, seven-bath house asking price

about 0:16:10
All figures and comparisons, as told in 2026

Property crime

"about a third of the national average"

Comparison: "national average". Direction: below.

As told in 2026 about 0:20:23

Violent crime

"less than one quarter of the average"

Comparison: "national average". Direction: below.

As told in 2026 about 0:20:30

Population

"4,859"

No direction stated.

As told in 2026 about 0:11:26

Women

"about 52.3%"

No direction stated.

As told in 2026 about 0:11:50

Median age

"56.6"

Comparison: "national average". No direction stated.

As told in 2026 about 0:11:57

Married

"65%"

Comparison: "national average". No direction stated.

As told in 2026 about 0:12:15

Single with children

"5.2%"

No direction stated.

As told in 2026 about 0:12:27

Median household income

"$122,676"

Comparison: "$69,000 in the rest of the country". No direction stated.

As told in 2026 about 0:13:39

Cost of living

"105"

Comparison: "100 is average". Direction: above.

As told in 2026 about 0:13:45

Median home cost

"$428,200"

No direction stated.

As told in 2026 about 0:13:53

Average two-bedroom rental

"$2,140"

Comparison: "about $1,200 in the rest of the country". No direction stated.

As told in 2026 about 0:14:18

Two-bedroom, two-bath condo asking price

"$320,000"

Comparison: "just had a $10,000 price cut". No direction stated.

As told in 2026 about 0:15:02

Three-bedroom, three-bath house asking price

"$499,900"

No direction stated.

As told in 2026 about 0:15:23

Five-bedroom, seven-bath house asking price

"$2,399,000"

No direction stated.

As told in 2026 about 0:16:10

Murder house sale price

"$675,000"

No direction stated.

As told in 2026 about 2:58:24

The reviews

4.1 / 5 · average of 4

4.5 stars

“Rated 4.5 stars on Niche.”
about 0:09:42

5 stars

“Cosy, quiet, friendly and professional community with minimal commercial development, green landscapes, forest preserves, lakes and trails for hiking, horseback riding, running and skiing, with good schools, parks, first responders and small businesses.”
about 0:09:47

4 stars

“A peaceful area with lots of wooded areas, four seasons and many places to explore nature.”
about 0:10:20

3 stars

“Lived there several years and grew to appreciate its charm: a peaceful suburb within walking distance of small businesses and a big grocery store, with forest preserves nearby, though parts of town could be more walkable.”
about 0:10:40

In Illinois

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The story

Diane Georgia Turner was born on 26 June 1946 in Cook County, Illinois, to George and Anne Marie Turner. She grew up in a lower middle-class neighbourhood in Franklin Park, was valedictorian of her eighth-grade class at Lincoln Grade School and was remembered as extremely competitive and very bright. She went to Elmhurst College hoping to become a writer, but in 1966 she married Ronald Mueller and became a suburban housewife instead. Masters, born on 9 March 1935, was a married criminal defence and divorce lawyer with two sons. He and Diane began an affair almost at once, and her divorce from Mueller was final in 1972.

In 1974 Diane became pregnant, hoping a child would persuade Masters to leave his wife, but he forced her to have an abortion. She told him she would end the relationship unless he bought her a house and gave her a child, and in July 1977 their daughter Andra was born. In 1979, after Masters still refused to leave Benita and after beatings, Diane took Andra to live with her brother Randall 'Randy' Turner and his wife Kathy. Masters followed, promised to divorce Benita within a year and took Diane to the La Costa spa in Carlsbad, California. His divorce became final on 24 March 1980 and they married the next day at a Justice of the Peace.

By 1981 Diane was a trustee of Moraine Valley Community College in Palos Hills and vice chairman of its governing board. She had helped found the South Suburban Crisis Center for battered women in 1978 as a telephone hotline run from her kitchen, volunteered for Recording for the Blind and worked in state treasurer Jerome Casantino's campaign. She drove a yellow and white 1978 Cadillac Coupe de Ville with the plate DGM 19, wore furs and jewellery, and concealed the violence in her marriage; friends later described Masters shoving her down stairs and leaving bruises on her arms and neck.

Masters was corrupt on a grand scale. He was involved in payoffs to judges, an interest in a Chicago brothel and strip-club credit card laundering. He was sworn in at a tavern and was chief by 1973.

In autumn 1981 Diane met Jim Coskaleniac, an economics professor at the college, and by the December faculty Christmas party they were lovers. Masters learned almost immediately and asked police friends to watch her. On a family holiday in Sarasota, Florida, Diane gave him a last chance; he cut the trip short. In early January 1982 she decided to divorce, hired a lawyer and prepared to seek custody of Andra, telling friends she feared he would have her killed rather than pay alimony.

Masters hired a former policeman turned private investigator, Ted Nikaza, to bug the house. On 25 February 1982 Nikaza played him recordings from the kitchen telephone, including Diane and Coskaleniac reminiscing about a wine bottle used in sex. Masters destroyed the tapes and, according to the men present, said he would kill her, make it look like a home invasion and kill the dogs and cats too. On 18 March Diane had her hair done and attended a board meeting. The usual after-meeting drinks were moved to another restaurant and Coskaleniac stayed away on her instructions. She left at about 1 a.m. on 19 March and drove home, followed to within a hundred yards of the house by a nosy acquaintance, Genevieve Capstaff. Next morning the housekeeper found Masters at the kitchen table with Andra.

Randy Turner rejected the story, hired the Chicago agency Special Operations and went to the press, making the case a major story. On 24 August a tipster calling himself Jack Springer said he had heard Diane calling for help from a padlocked cabin on the Des Plaines River in Lake County. Police were sceptical, especially after two earlier $25,000 ransom demands that Masters said he took in cash to the Chicago and Northwestern station in Waukeegan, where nobody appeared. In autumn 1982 Masters claimed $100,000 on a college life insurance policy, had Diane declared legally dead and received two $50,000 cheques.

On 11 December 1982 an officer saw tyre tracks running into the Illinois Sanitary and Ship Canal in Willow Springs. Divers pulled out 25 cars; the 25th was Diane's Cadillac, keys in the ignition, her decomposed body in the trunk. She had been struck on the head and shot twice with a .22, and casings were recovered, one caught in her sleeve. Her wristwatch and the dashboard clock had stopped at 1.50. She was partly clothed, without shoes, pantyhose or underwear, and there was no sign of sexual assault. Dr Robert G. Stein, the medical examiner, blocked a reported request by Masters to cremate the body and held it as evidence. Masters attended a memorial service with Andra.

A task force began on 4 January 1983, but the case went cold until 1986, when Lieutenant Jack Reed took it over with investigators Paul Sabin and Robert Colby. Reed got the wives and girlfriends of corrupt officers to talk. The reconstruction was that a kill team waited outside the usual restaurant on 18 March but Diane never arrived. She reached home and surprised Masters.

Operation Safebet, the FBI vice and credit card inquiry, ran alongside. In early 1988 Masters married his housekeeper, Janet Bower.

Assistant US Attorney Thomas A. Scorza argued that Masters killed to keep control.

Andra became a Chicago-area lawyer, as did Masters' two sons.

The case

Murder of Diane Masters

Victims

Diane Masters. suburban housewife and Moraine Valley Community College trustee, wife of attorney ; born Diane Georgia Turner on June 26th, 1946

Accused and outcomes

As told in the episode, on 16 July 2026.

Accused

Accused

Accused

Outcome

Other people

Randall 'Randy' Turner. Diane's brother, who hired private investigators, went to the press and later got custody of the children
Kathy Turner. Randy's wife, with whom Diane stayed in 1979
Jim Coskaleniac. Diane's boyfriend, an economics professor at Moraine Valley Community College
Benita Masters. ' first wife
Ronald Mueller. Diane's first husband, serving in Vietnam when she divorced him
Andra Masters. Diane and daughter, later a Chicago-area attorney
Janet Bower. Masters' housekeeper and nanny, later his wife
Ted Nikaza. private investigator who bugged the house, later a prosecution cooperator
Joseph Hein. Cook County sheriff's sergeant present at the tape playback
Genevieve Capstaff. acquaintance who followed Diane to within a hundred yards of her home
Jack Bockman. former Cook County sheriff's police officer offered the $25,000 murder contract
Jack Reed. Cook County sheriff's lieutenant who reopened the case in 1986
Paul Sabin. investigator working with Jack Reed
Robert Colby. investigator working with Jack Reed
Dr Robert G. Stein. Cook County medical examiner who blocked cremation
Douglas Allen Snow. Diane's hairdresser
Donna. Masters' housekeeper
John 'Doc' Rust. Willow Springs village political boss
Sam Giancana. Chicago mob boss who sponsored
Jerome Casantino. Illinois state treasurer whose campaign Diane worked in
Lee Harris. Palos Township resident and community college board member
Clyde Snow. anthropologist who examined Diane's remains
Anthony Montalone. presiding judge at fundraising event
John Waters. Chicago private detective with Special Operations
Lieutenant Howard Vanick. commander of the sheriff's South Suburban Detective Unit

The timeline

  1. June 26th, 1946 Diane Georgia Turner is born in Cook Countyabout 0:24:39
  2. March 9th, 1935 is bornabout 0:32:14
  3. 1966 Diane marries Ronald Muellerabout 0:31:32
  4. January 16th, 1969 Diane goes to ' office to start her divorce (Masters law office)about 0:31:56
  5. 1972 Diane's divorce from Ronald Mueller is finalabout 0:35:09
  6. 1974 Diane becomes pregnant and Masters forces her to have an abortionabout 0:40:24
  7. July 1977 Daughter Andra is bornabout 0:42:49
  8. 1979 Diane takes Andra and moves in with Randy and Kathy Turnerabout 0:43:19
  9. March 24th, 1980 and Benita Masters' divorce becomes finalabout 0:45:19
  10. March 25th, 1980 and Diane marry at the Justice of the Peace (Justice of the Peace)about 0:45:48
  11. 1981 Diane is elected a trustee of Moraine Valley Community College (Moraine Valley Community College)about 0:47:44
  12. December 1981 Diane and Jim Coskaleniac's affair becomes sexual at the faculty Christmas party (Moraine Valley Community College)about 1:09:19
  13. Early January 1982 Diane decides to divorce Masters and seeks full custody of Andra (Masters home)about 1:10:55
  14. February 1982 Diane tells friends and family she fears will have her killedabout 1:13:15

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