Grey's Anatomy star Jesse Williams is trading in his signature scrubs for a set of tattoos and a thick gold chain. The actor will guest star in an episode of Power, set to air Sunday, Oct. 27 on Starz.

Per Entertainment Weekly, Williams will play Kadeem, LaKeisha's (La La Anthony) ex-boyfriend and the father of her son Cash for just one episode. His arrival comes after LaKeisha was murdered by her former best friend Tasha (Naturi Naughton) right before Tommy (Joseph Sikora) had planned to propose to her. Although both Kadeem and Tommy don't know who pulled the trigger, Tommy has already vowed to avenge her death.

A sneak peek at the upcoming episode, courtesy of EW, shows both men mourning LaKeisha's death, with Tommy promising to get to the bottom of her killing. "I ain't sure, but I promise you I'm [gonna] find out who did this sh-- and I'm gonna make it right," Tommy says in the video.

Naughton previously told TV Guide that she's "nervous" for Tasha following the shocking murder, and she has every right to be. As we've seen in the past, once Tommy puts his mind to something, there's absolutely no stopping him.

Catch Williams in action when Power airs Sunday, Oct. 27 at 8/7c on Starz.

Jesse Williams, <em>Grey's Anatomy</em>Jesse Williams, Grey's Anatomy