The family had better be persuasive. If the cops or prosecutors don’t believe the daughter or father, this thing will get to the petit jury. The grand jury won’t no-true-bill if the prosecutors make out the (anyway, pretty plausible) story that the dad shot the boyfriend for defiling his daughter and the daughter lied to keep the family together — Dad gets convicted they lose his income to prison and the house and all their money to the wrongful death suit.
Every shooting goes to grand jury I think, many get tossed