Leslie was killed in an accident while on duty in England. He was a leading Aircraftman and was only 21 years old. He was the only son of Herbert and Elizabeth Brown and they lived at Hill House in Hammersley Lane in Loudwater. He died on 4th March 1944 and is buried in High Wycombe cemetery (section A1 grave 75).
He joined the RAF in July 1942, previously to which he had been an assistant at the Wycombe Marsh branch shop of the Chesham and Wycombe Co-operative Society. He was formerly a member of the Co-operative Youth Club at High Wycombe.
His listing on the Commonwealth War Graves Commission site can be found here