Camden resident Tyhan Brown, 18, was arrested Friday at his uncle's home in Clarksville, Tennessee, officials said.
Gabrielle 'Gabby' Hill Carter was hit in the head by a stray bullet while across the street from her home in August in Camden.
She was shot August 24 while riding a bicycle, Camden County Police Chief Scott Thomson said, according to the Courier-Post.
Carter's mother, Meresa Carter-Phillips, told WPVI-TV that it was good that Brown was arrested 'but nothing is going to change the fact that my daughter is gone and I have a loss'.
'It was like a little relief off my back, but I still feel the same way, my daughter is not here anymore,' she said.