Deep End (1970)

Deep End (1970) 15-year-old Mike takes a job at the local swimming baths, where he becomes obsessed with an attractive young woman, Susan, who works there as an attendant. Although Susan has a fianc�, Mike does his best to sabotage the relationship, to the extent of stalking both her and her fianc�. Mike becomes increasingly desperate to have Susan for himself, with tragic results