It’s Six Degrees Of Nathan Fillion!

Another soap alum will be guest starring on ABC’s CASTLE: A Martinez (ex-Ray, ONE LIFE TO LIVE; ex-Roy, GENERAL HOSPITAL; Cruz, SANTA BARBARA) will appear on the show airing Monday, October 18, at 10 p.m. EST. In the episode titled “Anatomy Of A Murder,” Martinez plays Cesar Calderon, a former drug trafficker (who just so happens to be a huge fan of Richard Castle’s novels) who has tried to turn his life around. But when the investigation into the murder of a female doctor leads to Calderon, Castle — played, of course, by OLTL grad Nathan Fillion, ex-Joey — and Stana Katic‘s Beckett must decide if Calderon truly is innocent… or if he has something to hide about his involvement with the doctor’s death.

Read more after the jump!