TLS, one page, 7 x 8.75, White House letterhead, July 2, 1947. Truman writes to Elmer W. Moore. In full: “This is just a line to let you know that I am thinking of you in your great loss. My heart goes out to you in deepest sympathy….” Moore (1909–2001), a Secret Service agent for nearly four decades, spent a year on Truman’s presidential detail. Following the assassination of JFK, Moore would play a central role in the investigation headed by Chief Justice Earl Warren. After Warren began to receive death threats, he specifically requested that Moore be assigned as his personal security detail. Moreover, Moore played a crucial role in the investigation itself, conducting interviews with Jack Ruby (an acquaintance), Ruby’s roommate, several employees of the Texas School Book Depository, and the doctors at Parkland Hospital who desperately attempted to save the president’s life. Accompanied by the original mailing envelope. Mailing fold lightly touching signature, and a subtle hint of soiling and handling wear, otherwise fine condition. JSA/John Reznikoff Auction LOA and RRAuction COA.