Serial killer duos

Raymond Martinez Fernandez (December 17, 1914 – March 8, 1951) and Martha Jule Beck (May 6, 1920 – March 8, 1951) were an American serial killer couple. They were convicted of one murder, are known to have committed two more, and were suspected of having killed up to twenty victims during a spree between 1947 and 1949.
After their arrest and trial for serial murder in 1949, Fernandez and Beck became known as the Lonely Hearts Killers for meeting their unsuspecting victims through personal ads, posted in newspaper lonely hearts columns. A number of films and television shows are based on this case.

Gerald Armond Gallego (July 17, 1946 – July 18, 2002) and Charlene Adell Gallego (née Williams; born October 10, 1956) were two American serial killers and rapists who were active mainly in Sacramento, California, between 1978 and 1980. They murdered at least eleven victims, mostly teenagers, often kept as sex slaves before killing them.