Lawmen say the former Murphy Brown star knew he was being investigated in the death of Charemon Jonovich, 25, who was found shot in the head in Pastorelli's Hollywood Hills home in 1999, reports TV show Celebrity Justice.
Jonovich's death was initially ruled either an accident or suicide, but several months after her death the coroner indicated she had died as a result of "homicide".
Police were investigating the matter last year when Pastorelli, then 49, died of a drug overdose in March. The couple had a young daughter together.
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