'24: LEGACY' Premiere Event - ArrivalsJimmy Smits is ready for "Murder."

The actor is joining Season 4 of ABC's "How to Get Away With Murder" in a major guest arc. His role is being kept under wraps, but he is a "prominent figure" in Annalise's (Viola Davis) life and a key player in the season's big mystery.

Smits most recently appeared in "24: Legacy," Netflix's "The Get Down," and "Brooklyn Nine-Nine." He is a multiple Emmy nominee for "L.A. Law," "NYPD Blue," and "Dexter."

In the Season 3 finale, Annalise had proven herself and associate Frank innocent of the deaths of Wes, Rebecca, and Sam. Meanwhile, Wes's killer was revealed to be ... Laurel's father. At least, he ordered a family friend named Dominic to carry out the murder of his daughter's boyfriend.

"HTGAWM" Season 4 is likely to premiere in early 2018.