Jalen Brunson, NBA champ and, officially, actor.

The Knicks guard plays a detective in a new “Law & Order SVU” trailer that released on Friday.

Brunson appears opposite the show’s megastar, Mariska Hargitay, who plays Captain Olivia Benson in the long-running NBC police drama.

The pair are close friends and the actress is a diehard Knicks fan, as well as a staple on Celebrity Row at Madison Square Garden.

“Detective Madison,” Benson says in the trailer.

“Hey captain,” Madison, portrayed by Brunson, wearing a detective badge around his neck responds with a smile.

Episode 5 of Season 28 centers around an assault of a wedding guest at the reception.

“Benson and the squad uncover a secret that changes the course of the investigation; [DA Sonny] Carisi’s pursuit of justice becomes increasingly complicated when key witnesses refuse to cooperate,” the episode description reads.

Both Brunson and Hargitay teased his cameo on multiple occasions after the Knicks beat the Spurs in the NBA Finals to secure their first championship in 53 years.

Margitay first revealed their plan to have Brunson on “Law & Order SVU” during an appearance on the “Today Show” in August.

The Emmy-winning actress was a guest star on the “Roommates Show” live show — the weekly podcast hosted by Brunson and Knicks teammate Josh Hart — when the Knicks stars took the show experience to Randall’s Island Park in New York in September.

Hargitay was also on the Knicks’ championship bus during their victory parade in New York on June 18.

The “Law & Order SVU” episode with Brunson, entitled “Forsaken,” with Brunson will air on Nov. 5 at 9 p.m. on NBC and streaming on Peacock.