Barbera Stager

Shot two husbands in the head "accidentally" for the insurance money.
Book: "Before He Wakes", by Jerry Bledsoe 

http://www.geocities.com/traciy_curry/barbara_stager1.html

Barbara Stager claimed a gun under her husband’s pillow accidentally 
killed him while he was sleeping. Was it coincidence that Barbara’s 
first husband died of a gunshot wound to the head ten years earlier?