Matthew Perry, who portrayed Chandler Bing in the popular sitcom "Friends," has died at the age of 54. He was found unresponsive in a hot tub at his Pacific Palisades home, and law enforcement sources say that he died of an apparent drowning. No foul play is suspected, and the cause of death is still unknown pending toxicology testing. Perry had a history of addiction and related medical problems, which he described in his memoir "Friends, Lovers and the Big Terrible Thing". He had spent more than half his life in treatment centers or sober living facilities. However, it is not yet known if his addiction played a role in his death. The Los Angeles County coroners office has launched an investigation, which will likely take months and include toxicology tests.