What is the character name of the Priest that sacrificed his life to exorcise Regan MacNeil from the possession in the 1973 movie "The Exorcist"?

In William Peter Blatty's "The Exorcist" Damien Karras was born on April 12, 1933 to a Greek family. He became a Jesuit priest on July 30, 1957. Over the years, the priest began to doubt the existence of God, the Devil, and many Biblical and supernatural beings.

He is a Jesuit psychiatrist suffering a crisis of faith. He searches for proof to lead an exorcism, yet during his investigation he comes to realize that there is no better way for God to prove his own existence than to reveal the foul presence of a demon.

Along with fellow-Jesuit Father Lankester Merrin, Karras attempts to exorcise 12-year-old Regan MacNeil (who was possessed by a demon). In the process, Merrin dies. During the exorcism, the demon frequently brings up the subject of Karras's mother's death and how he wasn't there to see her die, which seems to trouble Karras emotionally. Father Karras provokes the possessed child, forcing the demon to channel itself into him instead. Karras, briefly dominated by the demon, throws himself out the window of the MacNeils' residence. He saw this as his chance to purge the world of the evil being and then tumbled down the stairs to his death.

A religious/horror film that struck the world by surprise and still makes you get the chills when watched. It is noted to be one of the most scary films ever made.