Investigators say Antonio Saldivar's autopsy shows the 17-year-old drowned. Saldivar disappeared Valentine's Day after he told his parents he was going to deliver a gift to a girl. His wrecked car was found later, but with no clue as to what happened to him.
Saldivar's body was found in the Houston Ship Channel about two weeks later. The autopsy says while the exact manner of death is undetermined, drowning was ruled the primary cause of death.