(Video)LeBron James, Heat dominate Thunder to win NBA 2012 championship Congratulations Miami Heat

The critics can stop now. King James is finally a champion.

Behind yet another stellar effort from the regular season's most valuable player, the Miami Heat routed the Oklahoma City Thunder 121-106 in Game 5 of the NBA Finals as LeBron James won his first championship.

James, whose "I'll be taking my talents to South Beach" declaration angered the masses and made the Heat into league-wide villains two summers ago, capped his stellar 2012 Finals with a triple-double. James scored 26, adding 13 assists and 11 rebounds and was unanimously voted the Finals' most valuable player.

Dwyane Wade and Chris Bosh, the other two-thirds of Miami's "Big Three," poured in 20 and 24, respectively. Mike Miller scored 23 points on 7-for-8 shooting from 3-point range for Miami, which adds this title to the one it claimed in 2006.

Kevin Durant scored 32 in a losing effort as the Thunder lost four straight following a Game 1 victory in Oklahoma City. Russell Westbrook had just 19 on 4-of-20 shooting as the Thunder were felled by turnovers and poor 3-point shooting.

James, Wade and Bosh came out with 3:01 left, and the Heat crowd roared the rest of the way.