International Ice Hockey Federation makes neck guards mandatory after Adam Johnson's death
Nottingham Panthers pay tribute to late player Adam Johnson
Police arrest man over death of ice hockey player Adam Johnson
'My choice for my kids': Capitals' Oshie wears neck guard in NHL game
League and union discuss on-ice safety after player's death in England
Police investigating death of Nottingham Panthers' Adam Johnson
Nottingham Panthers' Adam Johnson dies in freak accident in match with Sheffield Steelers
