News of her son's tragic death ushered in the worst moments of Sandra Cruz's life. After his father abandoned them, Sandra alone had raised Preston into the man he became. Now, trudging through the difficult task of setting Preston's affairs in order, Sandra begins learning new things about him. He was a star on a recreational beach volleyball team, he'd recently reconnected with his estranged father, and he was engaged to Krystal... a girl Sandra thought he'd broken up with. Before long, Sandra wonders if she really knew Preston at all.

Krystal's erratic behavior and strange claims cause Sandra, her sister Victoria, and Preston's father Charles to begin questioning if Preston's motorcycle crash was an accident or something more sinister. But each time they think they've figured out the truth, they're met with another shocking surprise. After all, how well can any mother truly know her son?

Boyfriend Killer will keep you guessing, with twists, turns, and surprises all the way to the chilling final moment.