Todd Heap, 37, was moving his truck in his driveway in the city of Mesa on April 14 when the accident occurred.
According to police, there were no suspicious circumstances and the former NFL star showed no signs of impairment.
Todd Heap was a two-time Pro-Bowler.
The accident occurred at about 16:00 local time on April 14.
The girl was taken to a local hospital after the accident but did not survive.
Todd Heap attended Arizona State University and was a first-round draft pick in 2001 for the Baltimore Ravens and played there for 10 seasons, becoming the team’s all-time leader in touchdown catches.
He played two seasons for the Arizona Cardinals and retired in 2013.
Todd Heap has raised money for sick and disadvantaged children through a charitable foundation, opening the Todd Heap Family Pediatric Center in Baltimore in 2010.
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