no one called 911 for a month. >> how in the world can a mother wait 30 days before ever reporting her child missing? it's insane. it's bizarre. something's just not right about that. well the answer is actually relatively simple. she never was missing. caylee anthony died on june 16th, 2008, when she drowned in her family's swimming pool. >> reporter: prosecutors said, among their key evidence was what they said was the stench of death coming from casey's car, a smell even george and cindy anthony choked on before dialing 911. >> it smells like there's been a dead body in the damned car. >> what do you believe the smell was from? >> truthfully i don't know. >> she wants to believe caylee was back there, i don't want to believe that.