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