Per wiki:

Andy Dick has a longstanding feud with former NewsRadio costar Jon Lovitz concerning the death of their mutual friend Phil Hartman. According to Lovitz, Dick had given Hartman’s wife Brynn cocaine at a Christmas party at Hartman’s house in 1997; Brynn, a recovering addict, began using drugs again, culminating in her killing of Hartman and her suicide on May 28, 1998.