Janie Lou Gibbs

Murdered her husband, three children and a grandson in 
Cordele, Georgia, for their life insurance policies.
Sentenced to five consecutive life terms, she was
released after 31 years as a "medical reprieve".  Mrs. 
Gibbs has Parkinson's disease, and is confined to a wheelchair.

http://www.crimelibrary.com/serial7/widow/6.htm

http://www.soupsong.com/d0499.html