PLANO — Plano police said a man who vanished on December 11 has been found dead .
Gregory Hugh Pierce, 53, had said he was going to see a doctor before disappearing from his home in the 1400 block of Scarborough Lane.
His sister told News 8 that Pierce hadn't been feeling well.
Police said Sunday that a citizen reported spotting the missing man's pickup truck on Saturday night. Pierce was was found dead in the truck with what appeared to be a self-inflicted gunshot wound, according to investigators.
No further details were released.