I saw the movie on TV around 2008 and it looked like a little bit older movie, maybe 80’s or 90’s.
I can remember one scene where he is on the beach and he is pretending to have a broken leg, so he asks some girl for help around the doors of his parked car. Then he takes a wrench which was hidden on the wheel of a car and hits her in the head.
It sounds like that could be about Ted Bundy. Maybe The Deliberate Stranger (1986)?