The article makes no mention of whether or not police checked the casket to make sure the body was still in there, and if they had they would have found the casket empty because it's a Cursed Hearse and it allows the body in the coffin to steal the soul of the driver and renimate so it can run off and do undead stuff. Cursed Hearse: The only funeral you're driving your own. Coming soon to VHS.

Sources: CBS Los Angeles