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 211 – Tina McMenamin
The Trail Went Cold – Episode 210 – Carol Woolsoncroft
The Trail Went Cold – Episode 209 – Ralph Probst & Michael O’Mara
The Trail Went Cold – Episode 208 – Celina Mays
The Trail Went Cold – Episode 207 – Jack Davis Jr.
The Trail Went Cold – Episode 206 – Q&A
The Trail Went Cold – Episode 205 – Larry Griffin
The Trail Went Cold – Episode 204 – Mari Ann Fowler
The Trail Went Cold – Episode 203 – The Freedon & The Casie Nicole
The Trail Went Cold – Episode 202 – The Blount Family Bombing
The Trail Went Cold – Episode 201 – Erica Baker
The Trail Went Cold – Episode 200 – Melanie Flynn
The Trail Went Cold – Episode 199 – Patrice Endres
The Trail Went Cold – Episode 198 – Bill & Dorothy Wacker
The Trail Went Cold – Episode 197 – William & Margaret Patterson
The Trail Went Cold – Episode 196 – Zigmund Adamski
The Trail Went Cold – Episode 195 – Curtis Pishon
The Trail Went Cold – Episode 194 – Mary Jane Van Gilder
The Trail Went Cold – Episode 193 – Noreen Greenley
The Trail Went Cold – Episode 192 – Rodney Marks
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