Dr. Oz is investigating a sexual assault claim being leveled against Charlie Sheen.

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Tabloid reports claim Sheen molested the late child star Corey Haim while filming the 1986 movie Lucas. 

At the time, Haim was just 13 years old. Sheen was 19.

"Charlie Sheen categorically denies these allegations," his rep said.

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Haim’s mother, Judy, tells Dr. Mehmet Oz on his talk show that she doesn't believe Sheen molested her son. 

"I can tell you that as a mother I haven't seen one change in character," she said in the interview, which airs Friday. "I would have known if something was wrong." 

The new claims against Sheen came after Haim’s friend and fellow actor Dominick Brascia revealed the alleged encounter in an interview with the National Enquirer.

Another friend of Haim's, Goonies star Corey Feldman, wrote in his 2013 autobiography Coreyography that Haim was sodomized on the set of Lucas by an "adult male" that he didn't identify.