Actress Natalie Wood drowned in late November 1981 while spending the Thanksgiving weekend yachting near Southern California’s Catalina Island with her husband, actor Robert Wagner, and then co-star, Christopher Walken. Wagner and Walken reportedly had a loud confrontation on the night Wood died.

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The film star’s death was initially ruled accidental by the Los Angeles County Coroner, but investigators changed that to “undetermined” when they reopened the probe in 2011 amidst new information from the boat’s captain, Dennis Davern. Authorities also named Wagner as “a person of interest” in their resurrected investigation.

Robert Wagner adamantly denies any involvement with Natalie’s drowning and has never been charged in connection to his late wife’s death. Initially, the actor reportedly told authorities at the time that he believed Natalie may have fallen into the water while attempting to secure the yacht’s dinghy alone in the dark. He later reportedly said she might have been trying to leave the yacht.

Watch: Former Yacht Captain Claims To Recall New Details From The Night Actress Natalie Wood Drowned

The actress’s sister, Lana Wood, refutes Wagner’s claims. She insists Natalie didn’t know how to swim, had a morbid fear of water, and never would have gone near the sea alone. “Police now believe that she was a victim of an assault prior to going into the water and that she went into the water unconscious,” claims Dylan Howard, investigative journalist and host of the podcast Fatal Voyage: The Mysterious Death of Natalie Wood, adding, “That’s not my words, that’s the words from the LA County Sheriff’s department on the record. They believe this was foul play.”

Watch: Actress Natalie Wood’s Sister Claims Former Brother-In-Law, Robert Wagner, Has ‘Something To Hide’ In Drowning Investigation

Tune in to part one of this two-part Dr. Phil Thursday to hear what evidence Howard claims the police have uncovered.

Check here to find out where you can watch.

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'Someone Shouldn't Die Without Knowing What Happened To Them,' Says Journalist Of Renewed Probe Into Actress Natalie Wood's Death