Michael "Mike" Hammer is a fictional character created by the American author Mickey Spillane. Hammer debuted in the 1947 book I, the Jury. Hammer is a no-holds-barred private investigator who carries a Colt .45 M1911A1 in a shoulder holster under his left arm. His love for his secretary Velda is outweighed only by his willingness to kill a killer. Hammer's best friend is Pat Chambers, Captain of Homicide NYPD. Hammer was a World War II army veteran who spent two years fighting jungle warfare in the Pacific theatre against Japan.