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Since its 1992 premiere, NBC's long-running real crime television series, Dateline, has enthralled audiences. Dateline, which airs on NBC once a week and is available to stream on Peacock and Hulu, tells gripping stories featuring perspectives from detectives, relatives, and legal professionals.
A terrifying 2010 Seminole, Florida, homicide case was resurrected in the episode "True Lies," which aired on July 29, 2022, as part of Season 31, Episode 47. In addition to focusing on Diane Kyne, who was discovered strangled in her house, the hour-long piece also examined the ensuing legal disputes between her husband and son, who both accused the other of killing her.
Due to contradicting accounts, the case turned into one of Dateline's most divisive programs, bringing to light the confusion that frequently surrounds domestic homicides.
What happened to Diane Kyne?
On August 15, 2010, Diane Morton Kyne, a 49-year-old mother and wife, died tragically in Seminole, Florida. Diane was discovered unconscious in the bedroom of her house, where she lived with her husband, William “Bill” Kyne, and her 23-year-old son from a previous relationship, Kevin Kyne, as per the Dateline episode.
Those who knew her described her as lively, giving, and very focused on her family. Diane was declared dead immediately after first responders arrived on the site. Asphyxiation by strangling was determined to be the cause of death.
The appearance of two witnesses who each claimed to have located Diane after her death—and both accused the other of being the murderer—made the case instantly out of the ordinary.
The investigation swiftly turned into a matter of conflicting narratives because there were no outside witnesses, and both individuals gave sworn statements implicating one another.
Jim Beining, Pinellas County Sheriff's Office homicide detective, in an interview with Dateline, said,
“They both immediately accused each other as being the killer...It’s a difficult case.”
As per the Dateline episode, both people were first considered suspects by the police, but Kevin quickly came under further scrutiny. Prosecutors in Pinellas County claim that Kevin's story's contradictions and his purported behavioral problems were factors in their decision to arrest and prosecute him with second-degree murder.
Former assistant state attorney William Loughery said,
“The police showed up, he fought with the police, and even was trying to have his dog attack the police during it, so he was arrested for battery on a law enforcement officer and resisting arrest,”
After a trial that started in July 2012, Kevin was found guilty and given a life sentence without the possibility of release on August 2, 2012. Even though he was found guilty, the case did not end there. Kevin Kyne served almost three years of his sentence before a state appeals court reversed his conviction in February 2015.
As per the Dateline episosde, the appellate judges concluded that no reasonable jury could have found Kevin guilty beyond a reasonable doubt, citing a lack of evidence and issues with the jury instructions. Since his release from prison, he has continued to live freely. In the years since the acquittal, no fresh suspects have been apprehended, and the prosecution did not seek a retrial.
More about Diane Kyne's killer
The identity of Diane Kyne's killer is still unknown as of 2025. Even after a thorough investigation and court cases, no one has been found guilty of her death. No new accusations have been brought against Kevin Kyne or his stepfather, Bill Kyne, since his acquittal in 2015.
Although both men were initially suspected, authorities were unable to identify the real culprit due to conflicting testimonies and a lack of conclusive evidence against either man.
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Kevin has been under constant public attention even after being cleared, especially because of the unsolved case and the seriousness of the charges made by his stepfather, Bill.
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