Investigators in Washington are preparing to question relatives of a slain Spanaway family but say they might never know who suffocated a 5-year-old boy or what prompted his father to kill his wife and himself.
Army Sgt. David Stewart apparently shot his wife Tuesday during a chase on Interstate 5 near Olympia, then turned the gun on himself. Police later found their son, Jordan Stewart, dead at their home with a plastic bag over his head.
A sheriff's spokesman tells The News Tribune of Tacoma that relatives want the bag tested for fingerprints but doing so would not likely reveal who killed the boy, since either parent could have touched it.
Detectives say it could be months before they know whether they'll be able to determine what happened.
Information from: The News Tribune, http://www.thenewstribune.com