Adam Johnson was seriously injured during a hockey game between Nottingham Panthers and Sheffield Steelers when he received a skate to the neck during a tackle.
Johnson later died in hospital and an autopsy revealed that he died as a result of a neck injury.
“Our investigation began immediately after this tragedy and we have carried out extensive inquiries since then to piece together the events that led to Adam being lost in these unprecedented circumstances.” says Detective Chief Becs Horsfall.