Walter Cunningham, an astronaut on NASA's first space flight in 1968, has died at the age of 90, the US space agency announced on Tuesday.
Cunningham was the last living astronaut from this NASA flight, whose 1968 Apollo 7 mission paved the way for the first man to land on the moon a few months later in 1969. He died Tuesday morning in Houston , according to a NASA statement.
“Walt Cunningham was a fighter pilot, a physicist and an entrepreneur, but above all, he was an explorer. On Apollo 7, Walt and his colleagues made history, paving the way for the generation of Artemis we see today," said NASA's Bill Nelson, adding:
"NASA will always remember his contributions to our nation's space program and sends our condolences to the Cunningham family."
Cunningham's family also paid tribute to the astronaut:
"We wish to express our immense pride in the life he lived and our deep gratitude for the man who was a patriot, explorer, pilot, astronaut, husband, brother and father. The world has lost another true hero."

Born in Iowa in 1932, Cunningham earned a bachelor's degree in physics in 1960 and a master's degree in physics in 1961 from the University of California. In 1974, he completed his doctorate in physics at Harvard Business School.
Cunningham joined the Navy in 1951 and flew 54 missions as a night fighter pilot in Korea, according to a NASA news release.
"Cunningham has more than 4,500 flight hours in 40 different aircraft, including more than 3,400 in jet aircraft," NASA added.
In 1963, he was selected as a member of NASA's third astronaut class. Cunningham served as the backup lunar module pilot for Apollo 1 and the lead crew for the canceled Apollo 2 before being assigned to the Apollo 7 crew.
For the first human flight test of the Apollo spacecraft, Apollo 7, he was selected as the lunar module pilot for the 11-day mission.
"With Walter M. Schirr, Jr. and Donna F. Eisele, tested the maneuvers necessary for docking and rendezvous in lunar orbit using the third stage of their Saturn IB launch vehicle," NASA said in a statement, adding:
"The crew successfully completed eight tests, firing the service module's engine, measuring the performance accuracy of all spacecraft systems and enabling the first television broadcast of crew activities on board."
The members of Apollo 7, including Cunningham, won a special Emmy Award from the National Academy of Television Arts and Sciences.
"The 263-hour, 4.5-million-mile flight ended on October 22, 1968, with a crash in the Atlantic Ocean," he added.