John Joseph Joubert IV (July 2, 1963 July 17, 1996) was an American serial killer convicted of the murders of three boys in Maine and Nebraska. He was executed in Nebraska. Joubert was born in Lawrence, Massachusetts on July 2, 1963. A bright child, Joubert began reading at age three and renting books from a public library at five. He was later found to have an IQ of 123, signifying above average intelligence. Joubert's parents divorced when he was six years old, and he stayed to live with his mother, whom he greatly resented throughout his life as being excessively controlling. His mother forbade him from seeing his father, and often stood in the way of him developing connections with his peers and spanked him up until he was twelve years old. He also had problems with his peers, who taunted him on the basis of his relatively small build from the time he was in grade school up until high school.