[16] Appearing with the Redhawks in a top-six forward role, Johnson added seven goals and 12 points through 21 regular season games before ending his contract and return to North America on March 27, 2021.

[19] Johnson returned to Europe in the 2022 off-season, signing a one-year deal with the Augsburger Panther of the German Deutsche Eishockey Liga (DEL), on September 12, 2022.

[25][26][4] A video of the incident showed Petgrave's left skate kick up towards Johnson as he began to fall after colliding with another Panthers player.

[35] In England, an act that intends to cause grievous bodily harm to a person but results in their death can constitute murder; in such a case, a lesser constructive manslaughter charge is also available to prosecutors.

[38] On November 14, 17 days after the incident, South Yorkshire Police announced the arrest of an unnamed man on suspicion of manslaughter in Johnson's death.

[40] In September 2024, Nottingham Panthers announced the club would officially retire Johnson's number 47 jersey in a ceremony before their home Elite League game against the Fife Flyers on 14 December that year.

[43][44] The English Ice Hockey Association (EIHA), the governing body of the sport in England and Wales at all levels below the Elite League, introduced a neck guard mandate beginning in 2024.

[46] However, the Elite Ice Hockey League, which Johnson had been playing for at the time of his death, announced that it had no plans to mandate neck guards.

[47] Though not required in the league, several NHL players began wearing neck guards in games and practices following Johnson's death, including Anze Kopitar, Tyler Bertuzzi, T. J. Oshie, and Cole Koepke.

[43][48][49] USA Hockey approved a new policy, effective August 1, 2024, that requires all players and on-ice officials 18 years of age and under to wear neck laceration protection in games and practices.

[50] At the time of his death, according to family members, Johnson had purchased an engagement ring he planned to give to his girlfriend of three years, Ryan Wolfe.