So much for tenure.

Marvel Comics is bumping off Professor X — the founder of the superhero group, the X-Men, and a character who’s been around for 50 years — in a comic book landing in stores Wednesday. And in a development that what will get readers worked up, it’s his own prized student, the fan-favorite Cyclops, who delivers the death blow in “Avengers vs. X-Men #11.”

“I got a little teary-eyed when we were scoping out the moment in the room with the series’ writers and editors,” says Marvel Editor in Chief Axel Alonso.

“He needed to be the casualty in this story. There’s no more oh-sh-- moment that you can bring than having a son killing his father.”

Charles Xavier, however, may also have been a victim of changing tastes in comics. Created with the first batch of X-Men by Stan Lee and Jack Kirby in 1963, the follicular-challenged telepath became a Martin Luther King Jr.-inspired symbol for super-powered mutants always hounded by humans.

Xavier and his X-Men were “relatable to anybody who’s felt like the other, anyone who’s felt persecuted, whether due to race, gender, sexuality or just plain nerdiness,” Alonso says. And that’s just about everyone who has ever purchased a comic book.