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williams detailed a struggle with drug addiction to tamron hall. >> a lot of people often think whencohol, all the problems go away. that couldn't be further from the truth. drugs and alcohol are not the problems, they're merely symptoms of the problems. >> something that he sort of kept secret for a few years and revealed only in 2012, that when he was shooting "the wire" and playing omar, he was leading a secret double life where he was also suffering a cocaine addiction and actually was living homeless in newark. i think he wants to make sure that people knew what he overcame in order to get to where he was. >> reporter: after his pain and trauma came light from williams. >> how to use our voice -- >> reporter: championing causes, to fight for justice in circumstances reminiscent of his home. >> what up, what up, what up? >> reporter: working alongside young people with crew krount, the organization he cofounded to empower voters in over-policed communities. >> i know one thing, i am tired of seeing the police department being called for our mental health crises that we have. >> y

wlliams has long been open about his struggles with sobriety speaking to tamron hall earlier this year a lot of people often think that when a person puts down the drug or the alcohol that all the problems go away. that couldn't be further from the truth. drugs and alcohol aren't the problem. they're merely symptoms of the problem. >> reporter: his own struggles often reflected in a storied career spanning more than 25 years of work in television and film. >> omar come back tomorrow. >> reporter: his famed character omar, a notorious stickup man running the streets of baltimore. the role gained him attention from even president barack obama who called williams' portrayal fascinating. after "the wire" williams hit big again with another tough guy role, chalky white on the mob series "boardwalk empire." >> let's go, buck. >> reporter: williams racked up five emmy nominations in his career. >> you'll respect me! >> reporter: including for his role as montrose freeman in the period sci-fi show "lovecraft country" and the central park five depiction, "when they see us." >> when the police w