Boston Celtics big man Kevin Garnett won't be penalized by the NBA for his postgame incident Sunday with New York Knicks guard Bill Walker, a league source told ESPN.com's Marc Stein on Monday. Garnett had his hand around Walker's throat after the Celtics' forward missed a potential game-tying shot at the buzzer. The two had to be separated by coaches and players at the end of the Knicks' 106-104 win over the Celtics. Read more: http://espn.go.com/boston/nba/story...on-celtics-kevin-garnett-bill-walker-incident