DJ AM, a famous DJ and good friends with members of the famous alternative band Blink-182 (such as Travis Barker, who also survived that horrific plane crash), supposedly had been addicted to drugs before in his early 20s, but had been clean for ten years.
In any case I will not judge the poor guy too harshly. That plane crash last year was unimaginably traumatic and I'm sure every day of surviving it, having seen his friends burned alive, was an absolute nightmare and, for him, worse than dying. Without G-d in his life, this sort of an outcome was essentially inevitable.