UPDATE (8/11/15): ESPN's Adam Schefter is reporting that IK Enemkpali punched Geno Smith because of a $600 debt that Smith owed to him. Schefter just posted this to Facebook:

At the heart of the dispute between former Jets LB IK Enemkpali and quarterback Geno Smith is $600 that Enemkpali believed Smith owed him, per league sources. Enemkpali purchased a plane ticket for Smith to attend his July 11 football camp at Pfugerville High School in Pfugerville, Texas. However, days before the camp, a person close to Smith was killed in a motorcycle accident in Miami and Smith did not attend Enemkpali’s camp, per sources. After Smith did not attend, Enemkpali demanded that the Jets’ quarterback refund him the $600 he allegedly used to purchase a plane ticket. Smith told Enemkpali he would reimburse him the money, but he did not. Enkempali confronted Smith today about the money and the confrontation ended in a punch and broken jaw.

Enemkpali also issued an apology:
See original story below.
The upcoming New York Jets season, like so many others before it, is already off to a very rough start.

Geno Smith was sucker-punched in the locker room by a teammate this morning, and suffered a broken jaw that will keep him out of action for the next 6-10 weeks. Jets head coach Todd Bowles confirmed the news to reporters.

Linebacker IK Enempkapali was the man who did the damage, and the team immediately released him.

Ryan Fitzpatrick is next up on the depth chart at the quarterback position, which evidently isn't all that appealing to at least one of the team's wide receivers. 

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