About 75 friends and family members attended the private service for the 40-year-old Monjack Thursday, US Magazine reported.
Six months ago Monjack, who died Sunday, eulogized Murphy after she died suddenly at age 32.
"His wish was that he would be by Brittany," family spokesman Roger Neal told the magazine.
Before his death, Monjack was in the midst of establishing the Brittany Murphy Foundation dedicated to supporting youth in the arts, US Magazine said. Murphy's mother Sharon will now take over those duties.