There are six women on death row in the US, apart from Karle Faye Tucker, who is scheduled to be executed by lethal injection at midnight tonight in Texas.Betty Lou Beets (60) was convicted of killing her fifth husband in August 1983 at their home in, appropriately enough, Gun Barrel City. However, the police also found the remains of his predecessor - husband No 4 - buried under a shed.Erica Sheppard (24) was convicted of slashing the throat and stealing the car of an estate agent.Frances Newton (32) shot and killed her husband, son and twoyear-old daughter in 1987 to collect a $50,000 life insurance policy she had taken out on each victim.Cathy Lynn Henderson (40) kidnapped and crushed the skull of the three-year-old baby boy she was babysitting before burying the body in a shallow grave near Austin, Texas.Pamela Lynn Perillo (42) strangled two men before stealing their money, credit cards and guns.Darlie Routhier (28) was convicted last year of stabbing to death her two sons, aged five and six, while they slept.