“My father was Dr. George Hodel. He was a famous physician. He was also the prime suspect and the killer of Elizabeth Short, better known as ‘The Black Dahlia,’” says Steve Hodel.

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Twenty-two-year-old Elizabeth Short was found dead in a vacant lot in Los Angeles in 1947. Her story became highly publicized due to the graphic nature of the crime, which included her body being mutilated and bisected at the waist -- and is the most notorious unsolved murder in American history.

WATCH: Who Was 'The Black Dahlia'?

Hodel says after his father died in 1999, his half-sister, Tamar, informed him that the LAPD had considered their father a prime suspect in Short’s death. Hodel, a retired police detective, says he set out to prove his father had nothing to do with the murder – but what he found shocked him.

In the video above from Wednesday’s episode of Dr. Phil, hear about Hodel’s investigation into the murder and what led him to believe that his father killed “The Black Dahlia.”

And, on Wednesday, hear from George Hodel’s great-granddaughters whose top-ranked podcast, “Root of Evil: The True Story of the Hodel Family and the Black Dahlia,” is gripping the nation with never-before-heard archival audio of disturbing family secrets. Check here to see where you can watch.

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What Recordings Reveal About Possible Murderer Of 'The Black Dahlia'