Something fatal happened with a gun at 5 a.m. today at a southeast side apartment, but police aren't entirely sure what.

Bianca A. Perez, 21, is dead from a gunshot wound to the head. Police responded to a call of a shooting in the 3900 block of Arlington Square and found her dead in her apartment.

"Witnesses told investigators the gun accidentally went off, fatally striking Perez," police say.

They also say the investigation is continuing. No charges have been filed.