The star died at a hospital in Cape Cod, Massachusetts on Saturday (11Sep10), according to a representative for the facility. No details of his death have been released as WENN goes to press.
McCarthy started his career on Broadway in 1938 before making his big screen debut in Winged Victory in 1944.
His first starring role came in 1951 with the film adaptation of the Arthur Miller play Death Of A Salesman, which won him a Golden Globe and a Best Supporting Actor nomination.
He went on to play Dr. Miles Bennell in sci-fi classic Invasion of the Body Snatchers, which, although not a commercial success, turned him into a cult hero for generations to come.
He starred in dozens of movies, with his last in 2009.
McCarthy married actress Augusta Dabney in 1941, but the pair divorced in 1961. In 1970, he married Kate Crane and they went on to have two children. All three survive the actor.