Jasmine Richardson (formerly known as J.R.) was a 12-year-old Canadian girl who murdered her parents and baby brother. The murders occurred in 2006, and were executed by her and her 23-year-old boyfriend, Jeremy Steinke.
Jasmine had killed her parents because she was enraged at them for telling her to stay away from Steinke, and that she could live with her boyfriend. It has been stated that she originally didn't want to kill her younger brother, but she did so anyway, because her boyfriend pressured her into it. She stabbed her own brother several times, and Steinke finished him off by slashing his throat. They then escaped to a fast food restaurant nearby.
Richardson was tried and convicted in 2007, and she received a 10-year sentence. She's currently released.