The fine is a result of a Twitter exchange between Smith and Detroit Pistons guard Brandon Jennings. Jennings began by taking a shot at Chris Smith, J.R.'s brother, for landing spot on the Knicks roster. J.R. Smith later seemed to threaten Jennings.
Before Thursday's game, Smith said he did not threaten Jennings, and claimed the two are friends.
Earlier in the week, after several Twitter exchanges, Smith added: "Might call some of my Number street homies an put #Detroit on smash for a min!#DeadSerious- JR Smith (@TheRealJRSmith)"
Chicago Bulls point guard Derrick Rose is not expected to play on Friday night against the Toronto Raptors because of a hamstring injury.
Coach Tom Thibodeau announced that Rose was "unlikely" to play after Rose missed practice Thursday and sat out of Friday's shootaround. He was injured during Monday's game against the Cleveland Cavaliers.
Two days after being fined for using a racial epithet on Twitter, Los Angeles Clippers forward Matt Barnes said he will continue using the term, claiming it has become commonplace, ESPN reported.
"The word I used is a word that's used on the court, used in the locker room, used amongst my friends and family; it's a regular word to me," Barnes said. "I think my mistake was using it in a social manner, which I regret and I apologise for it. But you guys have to get used to it."
After being ejected from Wednesday's game, Barnes Tweeted, "I love my teammates like family, but I'm DONE standing up for these n---as! All this s--- does is cost me money. ..."
Cleveland Cavaliers point guard Kyrie Irving suffered a broken nose in Wednesday night's game against the Minnesota Timberwolves but will continue to play.
Irving was diagnosed with a minimally displaced right nasal fracture after taking an elbow to the face from Timberwolves forward Corey Brewer in the first quarter. He left the game for X-rays but returned to the court in the second quarter.