"He is currently in critical condition and it's a wait and see situation," the 61-year-old actor's manager, Charles Lago, wrote in an email.
Reuters reports Sizemore, whose film and television career has spanned decades, is best recognized for his roles as the battle-hardened sergeant at Tom Hanks' side in the 1998 film Saving Private Ryan and as commander of an Army Ranger battalion in 2001s Black Hawk Down. He was nominated for a Golden Globe Award in 2000 for best actor in a miniseries or film made for television for his role in Witness Protection.
