from www.tmz.com – “Dexter” — the show about a charming serial killer — was used as bait to lure a Las Vegas showgirl to her death … this according to investigators.

According to the Las Vegas Metro Police Department, 31-year-old Deborah Flores-Narvaez told her roommate she was going to her boyfriend’s house to watch “Dexter” on December 12 … the last day she was seen alive.

Cops believe when Deborah got to her BF’s house, the two got into a fight — and the BF choked her to death. Cops believe the BF — an alleged scumbag named Jason Griffith — then chopped off her legs and buried her in cement in an effort to hide the body.

Eventually, Jason’s roommate — who was allegedly involved in hiding the body — informed police about the killing and led cops to Flores-Narvaez’s corpse.

Griffith was arrested and charged in connection with the murder — and according to the Las Vegas Sun, he told police the killing was “not a premeditated thing.”