Betty Butler

was executed June 11, 1954, for strangling and then drowning
Evelyn Clark, 35, in front of witnesses. Ms. Butler didn't deny the
killing but argued it was justified because Ms. Clark made sexual
advances toward her.  In reality, the two were involved in a 
jealous lesbian love triangle.

http://www.cincypost.com/news/1999/doubl021999.html

Ms. Butler, 26, of the West End, was convicted of using a handkerchief to
strangle Ms. Clark in Sharon Woods Park and then, in front of fishermen,
dragging her to the lake and holding her head underwater.

http://www.cincypost.com/news/2000/dpensd092500.html