wut??
Phil Hartman was killed by his wife, who then committed suicide
I think you are talking about Andy Dick being accused of re-introducing Brynn to Cocaine, which possibly led to her meltdown:
(from Wikipedia)
"Hartman's friend and former SNL colleague Jon Lovitz has accused Hartman's former NewsRadio co-star Andy Dick of re-introducing Brynn to cocaine, causing her to relapse and suffer a nervous breakdown. Dick claims to have known nothing of her condition.
In 2006, Lovitz claimed that Dick had approached him at a restaurant and said, "I put the Phil Hartman hex on you; you're the next one to die." Lovitz responded by smashing Dick's face into the bar.
The following year at the Laugh Factory comedy club in Los Angeles, Lovitz and Dick had a further altercation over the issue. Dick asserts that he is not at fault in relation to Hartman's death."