Mike Tyson knew Robin Williams, he told Howard Stern in a SiriusXM radio interview Wednesday.

And they even had the same drug dealer at one point. The boxer/actor was talking about addiction, depression and his battle with demons, USA Today is reporting. Tyson explained to Stern, “People that deal with this situation (addiction), we know each other.”

Tyson said he and Williams had been at meetings together. Williams had struggled with abuse since the 1980s, entering rehab in 2006 and again on July 1, about a month before his August death.

Did they confide in one another?

“This is very interesting,” said Tyson, adding, “When I met him and he said, “I was waiting for you. … He started telling me about somebody I was purchasing from. I said to myself, how does he know this lowlife dealer I know? They shouldn’t be in the same state. You go to every measure to get high. Everybody knows everybody.”

Click here to read to listen to audio. Warning: language is graphic in parts

Mike Tyson. AP File