Killers is the second studio album by English heavy metal band Iron Maiden. It was first released on 2 February 1981 in the United Kingdom by EMI Records and on 6 June in the United States by Harvest and Capitol Records. The album was their first with guitarist Adrian Smith, and their last with vocalist Paul Di'Anno, who was fired after problems with his stage performances arose due to his alcohol and cocaine use. Killers was also the first Iron Maiden album recorded with producer Martin Birch, who went on to produce their next eight albums until Fear of the Dark (1992).