CASTLE – “Murder, He Wrote” – Castle and Beckett’s plans for a romantic weekend in the Hamptons are interrupted when a dying man stumbles into Castle’s backyard, collapsing into his pool.  Unable to escape the lure of the investigation they join up with the small town’s well-intentioned, but inexperienced sheriff to find the killer, on “Castle,” MONDAY, OCTOBER 15 (10:01-11:00 p.m., ET) on ABC. (ABC/ERIC MCCANDLESS)