Like a soldier returning home from war, the fight may be over for retired NHL enforcers, but adjusting to a normal life isn't easy.

The Last Gladiators, a documentary by Oscar-winner Alex Gibney, focuses on Chris "Knuckles" Nilan, one of the most popular, and most feared enforcers of the 1980s.

Over his 13-year career spent in Montreal, New York, and Boston, Nilan accumulated 3,043 penalty minutes, 110 goals, one Stanley Cup, and a lifetime's worth of scars, thanks in large part to 251 on-ice fights.

"In some respects, I wish he never played hockey," his father Henry is filmed saying through tears.