The last prince of Glen Rock?

This is a completely fictional account; the person mentioned herein has been honored and long revered as one of the finest teachers of Glen Rock High School. Please allow this work to serve as a reminder of his years of service.

Goodnight, sweet prince.
Those are the chilling words etched into the ominous black plaque that hangs on the wall in the front of room D-125. The strangely out-of-place memorial hangs directly in the center of the room’s northwest wall. Even more unsettling, however, is the alleged rumor that the remains of Howard E. Watterson are interred behind the plaque. Most students never even give the wall (or the plaque) a second glance, as Mr. Jason Toncic, the English teacher who uses the room, keeps the projector screen pulled down over it.
“I don’t like the feeling of being watched by departed teachers,” said Mr. Toncic. “Even though I’m sure he was a wonderful person,” he added, looking around nervously.
Mr. Watterson is listed in the Glen Rock Faculty Alumni list as deceased, but no other mentions of him could be found.
“I wish we knew more about him,” said News Editor of the Glen Echo Lilia Wood. The plaque describes Mr. Watterson as a “master teacher” and a “champion of the American Indian.” It informs us as well that “His gentleness, his warmth, his light, his standards of excellence are forever part of room 111.” Is this perhaps a hint at the final resting place of Mr. Watterson?
“I think it’s terrifying. I don’t want to be in this room ever,” said Sophomore Victoria Messikan.
“It’s creeping me out,” agreed Senior Pat Lawless.
Some suspect that something more than just a mythical skeleton lay inside the stonework of room D-125.
“One day I saw the words ‘let me out’ written on the wall,” said Mr. Toncic. “The next day, it was gone.”
Whether or not the spirit of Howard E. Watterson is haunting his former classroom may be brought forward at the next Board of Education meeting, and if it is, then answers will be demanded.