When a police officer is found dead in her home with a bullet between her eyes, who investigates?

Both Ciara Estrada and her boyfriend were San Diego police officers. They went with friends to a New Year’s Eve party. Pictures from that night show the smiling couple. The next day, Ciara was dead … discovered on her bathroom floor with her gun in her lap.

Her own department investigated the death and quickly ruled it a suicide. Investigators, who were her colleagues, made no arrests. Identified no suspects.

But her family says there’s more to her story – tragic circumstances that should have prompted a more thorough investigation. They don’t think the police dug deep enough into the death of one of their own.

EDITORS' NOTE: A previous version of this episode incorrectly stated which of Ciara Estrada’s guns was in her lap when police found her dead.