James Pomeroy, also known as the Boston Boy Fiend, was the youngest person in the history of Massachusetts to be convicted of first-degree murder, being 14 years old. He tortured several people and killed 2, making him the youngest serial killer in US history. He went on trial for the murder of 4 year old Horace Millen in 1874 and was sentenced to death, although this was commuted to life in prison in solitary confinement.












