In the "Dear sis" episode of M*A*S*H, the frustrated Catholic chaplain at the military hospital camp near the Korean front lines writes a candid letter to his sister, a nun.

"I'm almost desperate to be useful, sis," writes Father Francis John Patrick Mulcahy. "No one comes to confession. I have no one to grant absolution to, no one to give comfort to, no one who even wants to bend my ear for 10 minutes."

Later, a patient attacks a nurse and slugs the priest. By reflex, Mulcahy -- a former Catholic-school boxing coach -- punches back. The gentle chaplain is despondent afterwards and doubts that he is making a difference.

"I'm Christ's representative," he tells a surgeon. "Suffer the little children to come unto me. Do unto others. ... I'm not supposed to just say that stuff, I'm supposed to do it."

The actor behind this unique character was William Christopher, who from 1972-83 portrayed one of the most sympathetic priests in pop-culture history.

Here's the bottom line, according to Greg Kandra, a 26-year CBS News veteran who now serves as a permanent Catholic deacon in Brooklyn: "For a time, he played the most visible Catholic priest on American television -- arguably the most recognizable man of the cloth since Archbishop Fulton Sheen."

Christopher, 84, died of cancer on December 31 and is survived by his wife of 60 years and their two sons. His M*A*S*H co-stars hailed him as a professional who -- to an unusual degree -- disappeared into this singular role in a show that, in reruns, remains popular with millions.