The military said preliminary reports do not indicate the crash was caused by enemy fire, and the cause is under investigation.
The gunman had been married to the woman he killed, and the man fatally shot is believed to have been dating her, police said.
The remains were found in Lincoln County late Monday after Jennifer Rothwell's husband gave police information about the location, police said.
Two Illinois state troopers were helping a couple who were stranded along a highway, when an out of control truck headed right for them. The officers’ quick reaction and directions to run allowed everyone to survive the dramatic close call.
"People need to understand this is not a joke and it does take a toll on people's emotional stability," one student said.