Coroner: 16-year-old asphyxiated after becoming trapped in van

A 16-year-old boy called 911 and said he was trapped in a minivan at Seven Hills School hours before he was found dead there Tuesday night. He asked a 911 dispatcher to send officers immediately, saying he was trapped and dying.  "I probably don't have much time left, so tell my mom I love her if I die," he said.