What happened to cooper after the mission?

Leroy Gordon Cooper Jr. was the youngest of the seven astronauts selected for Project Mercury, the United States' first human space program. He piloted Mercury‑Atlas 9 in 1963, becoming the first American to spend an entire day in space, the first to sleep there, and the last solo American orbit. After the mission, Cooper returned safely to Earth. He later passed away on October 4, 2004, at the age of 77. No further spaceflight missions or public career highlights are documented in the provided evidence.