...for those of you who are Space Program historians.

http://space.com/news/gordon_cooper_041004.html

"Cooper, known as "Gordo" to his friends and colleagues, died Monday at his Ventura home of natural causes. He had been suffering from heart problems and showed symptoms of heart failure over the weekend, former Mercury astronaut Wally Schirra said.

Cooper was the youngest and perhaps cockiest member of the original seven Mercury astronauts. He achieved many key firsts as he piloted Faith 7 capsule in May of 1963."