The Speed Freak Killers - Loren Herzog and Wesley Shermantine

The Speed Freak Killers is the name given to serial killer duo Loren Herzog and Wesley Shermantine, together initially convicted of four murders — three jointly — and suspected in the deaths of as many as 72 people in and around San Joaquin County, California based on a letter Shermantine wrote to a reporter in 2012. They received the "speed freak" moniker due to their habitual methamphetamine abuse.