Steve Hodel says that he began looking into who killed “The Black Dahlia” when his half-sister told him that police suspected that their late father, Dr. George Hodel, committed the 1947 murder. Hodel says he was intent on proving his father’s innocence, but as he investigated deeper, he says he found evidence that he believes proves his father murdered her – and may have killed others.

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In 2012 and 2013, Hodel says he was permitted to do a forensic investigation at the home where his father lived at the time Elizabeth Short, known as “The Black Dahlia,” was found murdered in a vacant lot in Los Angeles, with her body cut in half. In the video above from Wednesday’s episode of Dr. Phil, Hodel and retired detective Paul Dostie describe what dogs found at the house and what soil samples tested revealed.

WATCH: Why Man Says He Believes His Father Was A Serial Killer

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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'Root Of Evil' Podcast Hosts Share Dark Family Secrets For First Time