NEW YORK (AP) — A bar worker at a popular Times Square karaoke club was arrested Thursday after confessing to beating a woman to death with a pipe on the club's roof during an argument, police said.

Syed Rahman, 24, admitted he smashed Ingrid Rivera over the head Monday during a birthday party for rapper Lil' Kim that the victim had paid to attend, Police Commissioner Raymond Kelly said at a news conference. Her body was discovered Wednesday afternoon.

It was unclear what Rahman and Rivera, who had met for the first time inside Spotlight Live club that night, were arguing about. But a friend of Rivera pointed police to Rahman by telling them she had fought off his sexual advances on the roof shortly before the slaying, Kelly said.