James B. Grinder (1945–2010) was an American serial killer and rapist who murdered three teenage girls in Arkansas and a woman in Missouri between 1976 and 1984. Grinder wasn't apprehended until his confession in March 1998. However, authorities still had little evidence tying Grinder to the murders, so they used a technique known as brain fingerprinting to help prove his guilt. In 1999, Grinder was convicted of the four murders and sentenced to life imprisonment. He remained imprisoned until his death in 2010.