Combat veteran shot friend from behind, then self

School teacher David Draa shot and killed his friend and colleague as he knelt over to fix a flat bicycle tire before he took his own life, police say.

The murder-suicide Sunday in Montgomery County has puzzled detectives who say the victim, Steven “Kyle” Hickman, 30, had been trying to help Draa, also, 30, through personal issues, possibly from fighting in the Iraq War, police said.