Suffering from what would today be described as post traumatic stress disorder (PTSD), Murphy slept with a loaded handgun under his pillow. He looked for solace in addictive sleeping pills. In his last few years, he was plagued by money problems but refused offers to appear in alcohol and cigarette commercials because he did not want to set a bad example. Murphy died in a plane crash in Virginia in 1971, which was shortly before his 46th birthday. He was interred with military honors at Arlington National Cemetery, where his grave is one of the most visited.