Mark David Chapman is an American man best known for the assassination of musician John Lennon on December 8, 1980. Chapman shot Lennon outside the Dakota apartment building in New York City, where Lennon lived. He was motivated by a desire for notoriety and was later diagnosed with mental health issues. After the shooting, Chapman was arrested and eventually sentenced to 20 years to life in prison. He has been denied parole multiple times since becoming eligible in 2000. His actions had a profound impact on Lennon's fans and the music world, leading to widespread mourning and reflection on violence against public figures.