Autopsy results are still pending. However, the coroner's office indicates Monjack died from natural causes.
Murphy died last Dec. 20 after collapsing in the home.
Monjack is credited as producer and co-writer of the 2001 film "Two Days, Nine Lives" and executive producer of the 2006's "Factory Girl."
Monjack will be buried at Forest Lawn Memorial Park in the Hollywood Hills. The private funeral is set to begin at 3 p.m.
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