October 13, 1982. Morro Bay, California. The decomposed body of 43-year old Dian Harlin is discovered in a stand of trees next to a beach and she has been strangled to death with a leash belonging to one of her dogs. It turns out that Dian’s eccentric 47-year old husband, Hugh Harlin, had failed to report her missing for eleven days and since the couple was known for having a turbulent relationship, Hugh becomes a potential suspect in his wife’s murder. Four years later, Hugh inexplicably vanishes without a trace after his abandoned pick-up truck is discovered by the side of the highway. Investigators are unable to determine if Hugh’s disappearance is connected to Dian’s murder, but both cases are never solved.
May 3, 1992. Polk County, Florida. After attending a rodeo, 31-year old Larry Costine and his 26-year old girlfriend, Melissa Jo Sermons, return to Larry’s mobile home. Larry’s nude body is eventually discovered inside the trailer and since he was shot four times and Jo has gone missing, investigators initially suspect that Jo killed Larry and went on the run. However, two decades later, law enforcement announces that they now believe Jo was a victim and was murdered by the same person who shot Larry. While Jo’s ex-boyfriend is considered to be the prime suspect, there is not enough evidence to charge him with the crime and Jo is never found.
On this week’s episode of “The Trail Went Cold”, we cover two unsolved mysteries in which one half of a couple was murdered while the other half went missing.
Additional Reading:
https://unsolved.com/gallery/hugh-harlin/
https://charleyproject.org/case/hugh-frederick-harlin
https://www.newspapers.com/image/808583090/
https://www.newspapers.com/image/808464923/
https://unsolved.com/gallery/larry-costine/
https://unsolvedmysteries.fandom.com/wiki/Larry_Costine
https://www.newspapers.com/image/339386848/
https://www.newspapers.com/image/339518288/
https://www.newspapers.com/image/339522597/
https://www.news-journalonline.com/story/news/2013/07/06/deland-man-a-suspect-in-1992-killing-womans-disappearance/30632866007/
https://www.theledger.com/story/news/2014/08/09/1992-costine-slaying-case-suddenly/8187709007/
https://www.theledger.com/story/news/2014/08/30/suspect-indicted-on-perjury-charge/26984190007/
https://www.theledger.com/story/news/2014/09/11/bail-set-at-5-000/8191605007/
“The Trail Went Cold” is on Patreon. Visit www.patreon.com/thetrailwentcold to become a patron and gain access to our exclusive bonus content.
“The Trail Went Cold” is doing a weekly livestream show on Vokl every Thursday from 7:00-8:00 PM ET as part of their “True Crime Thursday” line-up. For more information, please visit their website.
“The Trail Went Cold” is going to be appearing on podcast row at “Crimecon UK” at the Tower Bridge, Leonardo Royal Hotel & Spa in London on June 10-11, 2023, as well as “Crimecon” at the World Center Marriott in Orlando, Florida on September 22-24, 2023. To get a 10 % discount on the purchase of tickets to either event, please use our specialized promo code, “COLD23”, by visiting https://www.crimecon.co.uk or https://www.crimecon.com.
The Trail Went Cold is produced and edited by Magill Foote.
All music is composed by Vince Nitro.
The Trail Went Cold – Episode 362 – Margaret Dash, Retha Hiers, and Donyelle Johnson
The Trail Went Cold – Episode 361 – Jack Brown
The Trail Went Cold – Episode 360 – Patrick Mullins
The Trail Went Cold – Bonus Episode – New Year New Binge
The Trail Went Cold – Episode 359 – Update, Part 4
The Trail Went Cold – Episode 358 – Amber Crum
The Trail Went Cold – Episode 357 – Paul Logan and Tracey Mertens
The Trail Went Cold – Episode 356 – Cathy Jo Bohlken
The Trail Went Cold – Episode 355 – Amy Wroe Bechtel
The Trail Went Cold – Episode 354 – Danielle LaRue
The Trail Went Cold – Episode 353 – The Chen Family Murders
The Trail Went Cold – Episode 352 – Rae Ann Mossor and Norman Ladner
The Trail Went Cold – Episode 351 – Martha Moxley (Part 2)
The Trail Went Cold – Bonus Episode – Maze of Secrets
The Trail Went Cold – Episode 350 – Martha Moxley (Part 1)
The Trail Went Cold – Episode 349 – Ronald Sisman and Elizabeth Platzman
The Trail Went Cold – Episode 348 – Tina Marie Janose
The Trail Went Cold – Episode 347 – Michael Negrete
The Trail Went Cold – Bonus Episode – Unsolved Mysteries Guilty Pleasures
The Trail Went Cold – Episode 346 – Linda Kerr
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