Valerie Bauerlein

Nationally, data on justifiable homicides is hard to tease out because there's so much variation in the way police track these cases.

Since Hannah began her reporting, police have arrested Anthony Jean-Pierre.

They had searched his car on the day of Frederick's shooting and found a 9mm magazine with Pierre's DNA.

The gun that held the magazine has not been recovered.

Pierre is charged with possession of a firearm by a felon and possession of ammunition.

He is pleaded not guilty.

Pierre currently doesn't face homicide charges.

Frederick's case is still identified as a justifiable homicide on the Jacksonville Sheriff's Office website.

Almost two years after Frederick's death, his mother, LaToya Williams, thought the case was still an active murder investigation.

No one had told her that it wasn't.

Until Hannah did.

That's next.

About a year before her son died, Latoya Williams moved with her husband and four kids to Jacksonville.

She was hoping to give her oldest child, Fedrick, a fresh start.

He had been expelled from school, fathered a child at age 14, and had another on the way.

According to Williams, Fedrick had wanted to turn his life around.

He had applied to Job Corps, a federally funded career training program.

Williams said a letter arrived two days after her son's death.

He had been accepted.

Hannah went to Florida to meet with Williams and to tell her that Frederick's case had been cleared as a justifiable homicide.