James Bernard Lammers (July 16, 1924 – January 5, 1952) was an American mass murderer who murdered his pregnant wife and three children. On December 12, 1950, he strangled his wife, who was about seven months pregnant, to death, then set their trailer on fire, resulting in their children dying. James was convicted of two counts of first degree murder, sentenced to death, and executed in 1952.