Investigators are still trying to determine the cause of a San Diego plane crash that left at least three people dead and several others injured in the military housing neighborhood of Murphy Canyon on Thursday.

Dave Shapiro, a groundbreaking music executive in the heavy metal and hard rock scene, has died in a San Diego plane crash. He was 42.

The National Transportation Safety Board is examining a mix of clues and said the aircraft did not have a flight data recorder, which would have provided more information.