Glenn had been battling health issues since suffering a stroke and had been hospitalized in an Ohio State University medical center since last week, according to NPR.
Glenn was a decorated Marine who flew over 100 combat missions during World War II and the Korean War. He was awarded the Distinguished Flying Cross five times.
After serving in the military, Glenn joined NASA as one of the seven original Mercury astronauts.
After resigning from NASA in 1964, Glenn pursued political aspirations. He was elected to the U.S. Senate where he represented Ohio from 1974-1999.
In 1998, Glenn made history yet again by becoming the oldest person to travel into space on board the shuttle Discovery.
Click here to read the NPR article.
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