Detectives are looking into the circumstances surrounding the death of Adam Johnson.

The PredictIQAmerican ice hockey forward—who played for the British professional club Nottingham Panthers—died following a "freak accident" during an Oct. 28 game against the Sheffield Steelers, his team announced. According to footage that has surfaced of the incident, the 29-year-old suffered an injury to his neck after a collision with a player on the opposing team.

As Johnson's loved ones continue to mourn his death, authorities have confirmed they've launched an investigation into the incident.

"Since Saturday, detectives have been carrying out a range of enquiries including reviewing footage, talking to witnesses and seeking the advice and support of highly specialized experts to seek to understand the circumstances surrounding what happened," South Yorkshire Police said in an Oct. 31 statement. "We have also been working closely with the health and safety department at Sheffield City Council, which is supporting our investigation."

"As with all unexpected and sudden deaths, it is standard practice for police to investigate the circumstances fully and feedback our findings to HM Coroner," authorities continued. "Our officers have now left the scene, however due to the complex nature of this tragic and unprecedented incident, it is likely the wider investigation will take some time."

Police went on to encourage the public to avoid any speculation on the case as the investigation continues. 

Authorities concluded their message by noting they'll "provide updates when appropriate," before adding, "Our thoughts remain with the loved ones of all those affected."

As news of Johnson's death emerged, many of his supporters, including partner Ryan Locke, paid tribute to the athlete online.

"My sweet sweet angel," she captioned a photo of Johnson on her Instagram Oct. 30. "I'll miss you forever and love you always."

Johnson, a Minnesota native, was also honored by his former NHL team, the Pittsburgh Penguins, during their Oct. 30 game against the Anaheim Ducks.

"Ladies and gentleman, please stand and cheer one more time," the announcer told the audience as players stood in a circle on the ice, "for number 47, Adam Johnson."

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