Town note
Known for its musical and masonry heritage and a large collection of Prairie School architecture.
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FILE 645 / 6 November 2025 / 180 MIN / full
We are going to Iowa this week... Mason City, Iowa... in north central Iowa... Cerro Gordo County about 0:04:13
Known for its musical and masonry heritage and a large collection of Prairie School architecture.
about 0:05:45The first settlement in the area was around 1853 at the confluence of the Winnebago River and Calamus Creek.
about 0:07:10The town was called Shibboleth, Masonic Grove and Masonville before Mason City was adopted in 1855, named for a founder's son, Mason Long.
about 0:07:20Nicknamed River City because the Winnebago River and Calamus Creek converge there.
about 0:05:19Known for its musical and masonry heritage and a large collection of Prairie School architecture.
about 0:05:45The first settlement in the area was around 1853 at the confluence of the Winnebago River and Calamus Creek.
about 0:07:10The town was called Shibboleth, Masonic Grove and Masonville before Mason City was adopted in 1855, named for a founder's son, Mason Long.
about 0:07:20Nicknamed River City because the Winnebago River and Calamus Creek converge there.
about 0:05:1967.6%
about 0:14:07White 89.5% · Black 2.1% · Asian 1.2% · Hispanic 5.6%
Ethnicity can overlap race.Property crime
▲ about one quarter above
Violent crime
▼ about half
Asking price, three-bedroom house
about 0:16:44Asking price, five-bedroom house
about 0:17:28"27,385"
No direction stated.
As told in 2025 about 0:13:09
"about 51.2%"
No direction stated.
As told in 2025 about 0:13:19
"42 and a half"
Comparison: "a little higher than the national average". Direction: above.
As told in 2025 about 0:13:27
"about 52%"
Comparison: "50-50 is the usual". No direction stated.
As told in 2025 about 0:13:32
"89.5%"
No direction stated.
As told in 2025 about 0:14:00
"2.1%"
No direction stated.
As told in 2025 about 0:14:00
"1.2%"
No direction stated.
As told in 2025 about 0:14:00
"5.6%"
No direction stated.
As told in 2025 about 0:14:00
"67.6%"
Comparison: "50-50 is the norm". Direction: above.
As told in 2025 about 0:14:07
"Lutheran"
No direction stated.
As told in 2025 about 0:14:14
"just below"
Comparison: "the national average". Direction: below.
As told in 2025 about 0:14:33
"$56,009"
Comparison: "about $69,000 in the rest of the country". No direction stated.
As told in 2025 about 0:14:45
"$840"
Comparison: "$400 less than the national average". Direction: below.
As told in 2025 about 0:15:19
"$50,000"
No direction stated.
As told in 2025 about 0:16:20
"$124,500"
No direction stated.
As told in 2025 about 0:16:44
"$605,000"
No direction stated.
As told in 2025 about 0:17:28
"$66,000"
No direction stated.
As told in 2025 about 0:53:06
"about one quarter above"
Comparison: "the national average". Direction: above.
As told in 2025 about 0:21:26
"about half"
Comparison: "the national average". Direction: below.
As told in 2025 about 0:21:35
3.3 / 5 · average of 4
“Ranked the 31st best place to retire in Iowa and 467th best in the United States.”about 0:07:43
“Lived there my whole life; everyone is a little dramatic about the town's flaws; the perfect combination of big city but still local; events all year, not much crime and most people are nice.”about 0:08:23
“A small town that has always been small; the local government seems to want to keep it that way; companies have been shut out; plenty of jobs for the unskilled and fabulous restaurants but almost no shopping.”about 0:09:17
“Born and raised there; as a teenager it is a good place for old people to drive around and do nothing; 55 churches and an art museum, but run-down houses and untrimmed lawns; schools are good.”about 0:10:27
“A lot of crime in this town; the killing is really close.”about 0:11:33
“Murder, arson, abductions, bestiality, gang killings, meth labs, panty thieves, high utility bills, no jobs, corrupt police, evil judges, extreme weather, vandalism, slumlords, religious freaks, backstabbing busybodies and horrible bland food.”about 0:12:02
Mason City, Iowa, is in Cerro Gordo County in the north central part of the state, about two hours from Des Moines, with a population in 1993 of 27,385. He came from Britt, a small town outside the Mason City area, and was a skinny, blonde, freckled boy with big glasses who loved books and was good at mathematics and science. He graduated from high school in 1991 with a scholarship to North Iowa Area Community College and dreamed of becoming a pharmaceutical lawyer. His father, Jim, was a criminal and bank robber.
His best friend since first grade was Tim Cutkomp. They produced several pounds at a time and used two mules, Terry DeGeis, 32, a heavy equipment operator, and Greg Nicholson, a meth user and dealer, to carry the drug back to northeast Iowa. A few runs brought in hundreds of thousands of dollars.
Early in 1993 Mason City police found nearly 150 grams of pure methamphetamine and $5,000 in Nicholson's house. He agreed to cooperate and wear a wire.
Nicholson had moved in with Lori Duncan, 31, a Navy veteran and single mother of two girls in Mason City. Lori knew him as a man in recovery and did not know he was a witness. On July 7, 1993 she bought a 9mm handgun about five miles from her house.
On July 25 Lori's mother, Marge Milbrath, drove past and saw Lori wave. Amber, six, was playing across the street and came home around three for a picnic. All four were forced into a car at gunpoint and driven about ten minutes to a wooded area outside town, where a grave had already been dug.
He came back for the girls and she heard more shots. All four were buried in the same hole, one on top of another. On July 26 Marge noticed the drapes drawn and the cars parked chaotically. She and her husband let themselves in with a key. The house was quiet and untouched, with an unfinished dinner on the table, but Lori, Candy and Amber were gone. A note in Lori's handwriting said that Phyllis had to leave on short notice and would be in touch. Marge reported them missing.
He beat, tortured and shot DeGeis and buried him separately.
A third partner, Dan Cobain, was a confidential informant. On February 7, 1996 police searched the house and seized the lab, chemicals, notes and books, including books on binding and gagging prisoners. Cutkomp agreed to cooperate and wore a wire while they were on pretrial release.
Police used the maps, sonar and dogs. After three days they found Nicholson, Lori, Candy and Amber in one hole, Nicholson on top and the two girls at the bottom. Amber was still in her swimsuit, Candy in her sundress, and a T-shirt was pulled over one girl's face. The adults had been bound, gagged and shot multiple times; each girl had been shot once in the back of the head. Half a mile away they found DeGeis, face down in a shallow grave, beaten, tortured and shot, his skull fragmented.
The remains were withheld from the families until June 2004. Lori and her daughters were buried together in one white casket after a service at their church, with Elvis Presley's "Peace in the Valley" played and a 21-gun salute at the grave.
The defence argued there was no forensic evidence.
His last meal was a large pepperoni pizza, a two-litre bottle of Coke and breadsticks from Pizza Hut, costing $33.11, and his final words were Gerard Manley Hopkins's poem "Heaven-Haven" and a Hail Mary.
July 1993 and November 1993 / Lori Duncan's home in Mason City, Iowa, and a wooded area outside the city
As told in the episode, on 6 November 2025.
Accused
Accused
Public places are marked on the map.
crime scene
about 0:24:50body found
about 1:46:58crime scene
about 1:50:28business
about 1:50:22home
about 0:15:41school
about 0:26:44school
about 0:36:31home
about 0:58:36home
about 1:25:48other
about 1:36:50business
about 1:16:24other
about 1:17:23home
about 1:04:29other
about 0:42:54business
about 1:22:05other
about 1:06:02church
about 2:07:22