William Petersen Unrecognizable Five Years After Retirement

CSI: Scene Investigation icon William Petersen resurfaced in recently - five years after quitting Hollywood for good.

Petersen, now 72, is most famed for his role as the quirky, fastidious and knowledgeable CSI graveyard shift supervisor Gil Grissom on the hit show - but looked worlds away from the character as he stepped out.

The nominee, who now lives in with his second wife Gina Cirone and their twins, kept a low profile in a baseball cap and sporting a bushy beard.

His look was casual in a black shirt and sweats as he returned to - months after dishing on his decision to end his acting career for good.

Petersen is most identified with his lead role on CSI which he began starring on in 2000.

He played Grissom for the show's first nine seasons, and later returned several times throughout later seasons, including for the finale TV movie Immortality in 2015.

Although the series featured plenty of traditional police work, it also showed the investigators using their brains and science to help solve crimes through their detailed physical investigations.

Petersen initially rose to fame with lead roles in the crime classics To Live And Die In L.A. (1985) and Manhunter (1986) the first film to feature the character Hannibal Lecter.

Although the series featured plenty of traditional police work, it also showed the investigators using their brains and science to help solve crimes through their detailed physical investigations