A federal grand jury has indicted a retired D.C. police lieutenant for second-degree murder after fatally shooting a library police officer during a training session last August.

The retired lieutenant, Jesse Porter, had originally been charged last year with involuntary manslaughter while armed. A grand jury that was sworn in on March 24 upgraded the charges based on new evidence this week, indicting him on three different counts: second-degree murder, possession of a firearm during a crime of violence, and unlawful discharge of a firearm.

“Jesse Porter, within the District of Columbia, while armed with a firearm, and with the intent to kill another and to inflict serious bodily injury on another and with a conscious disregard of an extreme risk of death or serious bodily injury to another, caused the death of Maurica Manyan,” the court document reads.

According to the original charging documents from last Aug. 5, Porter shot and killed library police officer, Maurica Manyan, 25, during a session at Anacostia Neighborhood Library on how to use a concealed police baton. Manyan was training to be a full-fledged officer. Porter was working as a hired private contractor, having already retired from the Metropolitan Police Department. When officers arrived to the scene, Manyan was unconscious and not breathing with a gunshot wound to her chest. She was pronounced dead at a local hospital.

Various witnesses told police that the incident occured when Manyan paused the group’s photoshoot to fix her hair. Porter then got out of the photo line, picked up his firearm, and shot her. Porter later told a police officer that he and the class were “joking around when he removed his firearm from his holster and then heard it discharge,” according to the original charging documents. Porter kept telling the officer something to the effect of “I thought I had my training gun. Why did I do this? Is she okay?”

It’s unclear what evidence influenced the grand jury’s indictment.

Manyan’s family have faulted D.C. officials for allowing Porter to enter the library with a loaded gun, which they believe was not necessary for training. “We want to make it very clear that we are taking the position that this is not an accident,” Chelsea Lewis, the family’s attorney, told the Post.

Porter’s attorney did not respond to this reporter’s media inquiry.

Another status hearing is scheduled for next week.

This story was updated to correct a misstatement of the victim’s last name.