In early December 1974, a young couple and their roommate are found dead in their home in Sioux City. The background of the 3 makes it appear likely that their death was a direct result of their lifestyle, and some feel their list of potential enemies was so long that it would be impossible to narrow down and find the person or people responsible. After 47 years without a single arrest, it seems likely that could be the case.

Sources: 
Iowacoldcases.org by Jody Ewing
"Coriden testifies in own defense." By: David Lundy Sioux City Journal Saturday December 13, 1980 page 8
"False pregnancy case jury seated." By: David Lundy Sioux City Journal Wednesday December 10, 1980 page 20
"Negligence ruled out in cell death." By: Barbara Mack Des Moines Tribune Tuesday April 9, 1974 page 22
"Slaying of three last year in Sioux City still a mystery." By: Chuck Offenburger Des Moines Register Wednesday December 3, 1975 page 3
"Triple murder still haunts officers." By: Timothy Allen Sioux City Journal Tuesday January 9, 1992 page 1
The Billings Gazette Wednesday February 27, 1974 page 21
"Prosecution hits snag." By: Roger Hawthorne The Billings Gazette Tuesday April 8, 1969 page 34
"Quigg case goes to jury." By: Roger Hawthorne The Billings Gazette Wednesday April 9, 1969 page 22
"Pair held in Sioux City slayings." Iowa City Press-Citizen  Thursday December 5, 1974 page 2
"House Comes Down." Sioux City Journal Wednesday April 23, 1975 page 2
"Sioux City shootings at close range." Cedar Rapids Gazette Wednesday December 4, 1974 page 32

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