According to friends of the actor said Mimi O'Donnell had asked the actor to spend time away from their three kids while he tried to control his drug problem, reported New York Post.
"It was known that he was struggling to stay sober, and (girlfriend Mimi O'Donnell) had given him some tough love and told him he needed some time away from the kids and to get straight again," a Hollywood source said.
He was found dead of an apparent heroin overdose in his apartment Sunday morning.
"He was apparently in the throes of a major heroin addiction when he died," a law-enforcement source said, adding that there didn't appear to be another woman in the actor's life.