By Lynette Rice
Updated February 15, 2011 at 11:58 PM EST

Image Credit: Richard Shotwell/PR Photos; Carla Van Wagoner/PR PhotosA certain easy rider is motoring over to the set of CSI: NY. EW has learned exclusively that Peter Fonda will play an ex-partner of Det. Mac Taylor (Gary Sinise) for a two-episode arc that’ll air in late April.

Fonda, who will play William Hunt, will reconnect with Mac after a baddo they once put away is released from prison. Even worse, this so-called reformed criminal now has a vendetta against Fonda’s character.

The Easy Rider actor has added many TV appearances to his extensive film resume. Besides performing in small-screen movies like Journey to the Center of the Earth and The Gathering, Fonda guest-starred on ER.

So far this season, CSI: NY has averaged 10.7 million viewers and consistently wins its Friday at 9 time slot in eyeballs and adults 18-49.