Pinellas County Sheriff's investigators took 21-year-old Brandon Hood into custody after learning a BB was lodged in the girl's brain, with medical tests showing serious injuries.
Deputies say the girl's mother asked Hood to watch her daughter and another child while she left the home for a job interview on September 30 of last year.
"Before she left she specifically told him do not shoot the BB gun around the children," the sheriff's office said in a statement. "He had just been in the backyard shooting the BB gun at targets he had set up, and now the children were in the backyard playing."
As she was leaving, the mother reported hearing a crying child and returned inside the home to find her daughter bleeding from the head.
It remains unclear if she will ever fully recover.
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