PEOPLE in an interview published Saturday. The “Two and a Half Men” star continued: “She was already struggling with a drug problem. One that I was blissfully unaware of until a couple of weeks before the movie ended.”As a member of the “Brat Pack,” Moore, 61, went to rehab for drug and alcohol addiction in the 1980s.She relapsed in 2012 and returned to rehab to get sober again.“What would always be great about her was already evident; that incredible combination of vulnerability, toughness and beauty,” Cryer added abut Moore.Cryer, who played Moore’s love interest in 1984’s “No Small Affair,” said that he learned the ropes of Hollywood with her help.“She was incredibly charismatic and had a much better grasp of the business than I did,” he told PEOPLE.