Maggie Young 

On Nov. 22, 1965, a despondent, mentally ill woman named Maggie Young 
took her four daughters, one by one, into the bathtub of her Hawaii 
home and drowned them. The oldest was 5; the youngest, just 8 months.
Then she yanked her 8-year-old son from school, brought him home, and 
killed him the same way. She placed all the bodies, wet and nude, on 
twin beds - the girls on one, the boy alone on another.

Young immediately confessed, and after she was found unfit to stand trial, 
was committed to a state hospital. About six months later, she escaped 
to a chicken shed on the hospital grounds and hanged herself.

http://www.philly.com/mld/philly/news/columnists/jane_eisner/2878153.htm