She was shot and killed on Monday while in her boyfriend's bedroom, police say.
Investigators say the couple and another male friend were examining guns when a single shot was fired that struck Bookstaver in the head.
Police say they still don't know the exact circumstances or even who was holding the weapon at the time.
The shooting took place at Hudson Harbor, which is a new development of million dollar townhouses in Tarrytown.
The home belongs to Robert Gaulin, an entertainment lawyer. His son, Eric Gaulin, is a recent graduate from Elon University and works at a Harley Davidson dealership in New Rochelle.
Bookstaver is originally from Long Island. Sources describe the couple as shooting enthusiasts.
A car parked in the family's driveway on Tuesday morning was loaded with shooting supplies.