John Lennon, born on October 9, 1940, in Liverpool, was a prominent English singer, songwriter, and peace activist best known as a co-founder of The Beatles. After their breakup in 1970, he launched a successful solo career and became an anti-war activist, leading to political activism through music. Lennon was tragically murdered on December 8, 1980, by a fan, marking the end of his influential life and career.