(CNN) Al Worden, an astronaut from the Apollo lunar program, has died, NASA says.

walk on the flight back from the moon to retrieve film from cameras on the spacecraft, Worden was command module pilot on the Apollo 15 lunar landing -- and although he never got to walk on the moon, he performed a spacewalk on the flight back from the moon to retrieve film from cameras on the spacecraft, according to NASA

NASA earlier said Worden made three spacewalks but later clarified he made one, during which time he exited and re-entered the spacecraft three times.

As astronauts David Scott and James B. Irwin explored mountains during the 1971 mission, Worden circled around them.

"During this time he earned a world record as 'most isolated human being' while his crew mates roamed the lunar surface, and he was 2,235 miles away from anyone else," NASA Administrator Jim Bridenstine said in a statement.

Read More