The fine was the maximum allowed under the league’s collective bargaining agreement.
Lafferty lowered the boom on Colton with 4:50 remaining in the second period of Toronto’s 4-3 overtime victory on Saturday in Game 3 of their Eastern Conference first-round series. Lafferty was assessed a minor penalty for roughing.
The Maple Leafs hold a 2-1 lead in the best-of-seven series heading into Monday’s Game 4 in Tampa.
Lafferty, 28, has one assist in three games during the playoffs. He totaled 27 points (12 goals, 15 assists) in 70 games split between the Chicago Blackhawks and Maple Leafs this season.
NHL hits Leafs’ Sam Lafferty with max fine for cross-checking