"We have been carrying out extensive inquiries to piece together the events which led to the loss of Adam in these unprecedented circumstances.
"We have been speaking to highly specialised experts in their field to assist in our inquiries and continue to work closely with the health and safety department at Sheffield City Council, which is supporting our ongoing investigation.
"Adam's death has sent shockwaves through many communities, from our local residents here in Sheffield to ice hockey fans across the world." South Yorkshire Police said.