School caretaker Ian Coates was killed along with students Barnaby Webber and Grace O’Malley-Kumar in Nottingham by Valdo Caolcane, and Ian's son James said he felt "hatred" towards the attacker
Attacker Valdo Calocane, 32, has paranoid schizophrenia and killed three people and attacked three others in a spate of "atrocities" in Nottingham in June last year