When a young man’s body is found in a picnic pavilion in Tulsa’s Mohawk Park stripped of clothing and belongings, law enforcement is left with many questions. But within a matter of weeks, clues begin to emerge and authorities zero in on not one…but two killers.
Mark Osterloh as of 2025
Source: Oklahoma Department of Corrections
Owen Swaim as of 2025
Source: Oklahoma Department of Corrections
Episode Source Material
- Tulsa World: Murder Victim Found in Mohawk. By staff. Published July 28, 1975. Accessed February 12, 2026 via newspapers.com.
- Sapulpa Daily Herald: Picnic Area Yields Body. By staff. Published July 28, 1975. Accessed February 12, 2026 via newspapers.com.
- Sapulpa Daily Herald: Sapulpan’s Kin Rites Wednesday. By staff. Published July 29, 1975. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: No Park Death Arrests Made. By staff. Published July 29, 1975. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Car of Slain Owasso Man Located in Tulsa. By staff. Published August 2, 1975. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Police Arrest Pair in Death Of Man Found in Mohawk Park. By staff. Published August 26, 1975. Accessed February 12, 2026 via newspapers.com.
- Sapulpa Daily Herald: Two Arraigned In Man’s Death. By staff. Published August 27, 1975. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Ruling Makes It ‘Murder 1.’ By staff. Published November 6, 1975. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Judge Orders Mohawk Park Slaying Trial. By staff. Published December 12, 1975. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Witnesses Say Suspect Bared Death Details. By staff. Published April 9, 1976. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Drug Pusher Testifies In Tulsa Murder Trial. By staff. Published April 10, 1976. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Suspect Says Talk of Death Just Joke. By Ralph Marler. Published April 13, 1976. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Swaim Handed Death in Park Slaying Here. By Ralph Marler. Published April 14, 1976. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Swaim Formally Sentenced to Die. By staff. Published April 28, 1976. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Murder Trial Jury Selected. By staff. Published May 6, 1976. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Slaying Suspect Calls His Confession ‘Lies.’ By Ralph Marler. Published May 7, 1976. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Man Guilty Of Murder. By staff. Published May 8, 1976. Accessed February 12, 2026 via newspapers.com.
- JUSTIA: Swaim v. State. Oklahoma Court of Criminal Appeals. Decided September 27, 1977.
- JUSTIA: Osterloh v. State. Oklahoma Court of Criminal Appeals. Decided June 27, 1978.
- The Daily Oklahoman: Parole Denied To Three Killers. By Dan Marley. Published November 20, 1979. Accessed February 12, 2026 via newspapers.com.
- Tulsa World: Board Denies, Then Votes Clemency After Letters Read. By Doug Hicks. Published December 10, 1979. Accessed February 12, 2026 via newspapers.com.
- Sapulpa Daily Herald: Parole pleas are rejected. By staff. Published December 14, 1981. Accessed February 12, 2026 via newspapers.com.
- The Daily Oklahoman: 1 Recommended For Early Parole. By staff. Published December 12, 1982. Accessed February 12, 2026 via newspapers.com.
- The Daily Oklahoman: Inmates Given Second Chance at Life. By staff. Published July 6, 1986. Accessed February 15, 2026 via newspapers.com.
- The Daily Oklahoman: Ex-Death Row Inmate Loses Bid for Parole. By Ellen Knickmeyer. Published February 28, 1988. Accessed February 15, 2026 via newspapers.com.
- The Daily Oklahoman: Pre-Parole Status Granted to Slayer. By Don Mecoy. Published December 10, 1989. Accessed February 15, 2026 via newspapers.com.
- Tulsa World: Ill Inmate Serving Life Sentence Gets Parole Board’s OK. By Brian Ford. Published February 25, 1990. Accessed February 15, 2026 via newspapers.com.
- Tulsa World: Tulsa Killer Up For Parole. By Wayne Greene. Published December 5, 1990. Accessed February 15, 2026 via newspapers.com.
- Tulsa World: Parole Denied in Mohawk Park Killing. By Rex Hogan. Published December 7, 1990. Accessed February 15, 2026 via newspapers.com.
- Tulsa World: So-Called ‘Thrill-Killer’ To Stay Locked Up. By Wayne Greene. Published February 24, 1991. Accessed February 15, 2026 via newspapers.com.
- Tulsa World: Robber Gets Lecture Along With Parole. By Wayne Greene. Published December 5, 1991. Accessed February 15, 2026 via newspapers.com.
- Tulsa World: Ex-Death Row Inmates Rejected for Parole. By staff. Published February 25, 1992. Accessed February 15, 2026 via newspapers.com.
- The Daily Oklahoman: Board Rejects Parole for Ex-OU Player Convicted of Rape. By Anthony Thornton. Published December 4, 1992. Accessed February 15, 2026 via newspapers.com.
- Tulsa World: Inmates Denied Clemency. By Barbara Hoberock. Published February 25, 1995. Accessed February 15, 2026 via newspapers.com.
- Owen Lee Swaim v. State of Oklahoma: Motion to modify and amend judgment and sentence. Submitted March 23, 2017. Filed April 6, 2017. Denied April 11, 2017. Hard copy only. No direct link.
- Owen Lee Swaim v. State of Oklahoma: Application for Post Conviction Relief. Submitted December 15, 2017. Filed December 29, 2017. Denied April 27, 2018. Hard copy only. No direct link.
- Owen Lee Swaim v. State of Oklahoma: Response to Petitioner’s Second Application for Post Conviction Relief. Filed April 27, 2018. Hard copy only. No direct link.
- Owen Swaim Oklahoma Department of Corrections Inmate Profile.
- Mark Osterloh Oklahoma Department of Corrections Inmate Profile.
- State of Oklahoma v. Owen Swaim & Mark Osterloh Court File. Requested via public records request to the Apache Warehouse center and obtained February 2026. Hard copy only. No direct link.
- Find A Grave: David P. Lewallen
- Find A Grave: Maxine Lewallen
- Find A Grave: Raymond William Lewallen
- David P. Lewallen Obituary
- Owen Lee Swaim and Mark Osterloh OSCN Dockets. Hard copy only. No direct link.