CHELMSFORD -- Chelmsford High School girls' hockey coach Jason Fletcher has died, school officials confirmed.
Fletcher died in his sleep sometime between Monday night and Tuesday morning, School Committee Chairman Al Thomas said.
Word of Fletcher's death has shocked many in the community.
"I just saw him Friday night at the football game, with his wife, and his daughter on his shoulders," Thomas said. "He's the kind of guy almost everybody knew."
Thomas, a former Chelmsford High principal, said he knew Fletcher since he was a student and worked closely with his father, Jack Fletcher, a former teacher and athletic director at the school for many years. The elder Fletcher is now athletic director at Lowell Catholic High School.
"It's such a close family, and I can't even imagine what Jack and his wife are going through. It's so sudden," Thomas said.
Jason Fletcher most recently served as the Chelmsford High girls' hockey coach, but had also coached football in the past. He was a teacher at the SEEM Collaborative in Stoneham.
Thomas said Chelmsford High deployed crisis counselors Tuesday to help students cope with the loss.