Kevin Williams was a Coal Hill student who died on 12 October 2016 when Miss Quill tricked him into disintegrating himself with her displacement gun. The blast destroyed both himself and a Shadow Kin at the same time.
Kevin was 17 years old, and 5'8". A missing poster for him was later on a bulletin board on a wall near the school, which said he was last seen on Wednesday, 12 October at Coal Hill Academy. The Twelfth Doctor used his death as his justification for leaving Quill on Earth to defend Coal Hill, as her punishment. (TV: For Tonight We Might Die)