According to what I've read, it looks to me that Reyes caused the accident by darting out into the road to cross illegally.
Stallworth should not have been drinking and driving, but he stopped immediately and called 911, knowing full well that he was probably over the limit.
Its not as if he drove onto the sidewalk and hit somebody there, then left the scene.
“Every case that we prosecute, especially those that involve the death of a human being, is closely scrutinized to ensure that a fair and just resolution is reached for all parties,” said prosecutor Katherine Fernandez Rundle. “We have specifically looked at the unique facts involved with this charge, Mr. Stallworth’s excellent pre-incident history of community service, abundant references that attest to his good character, his lack of any traffic violations or criminal convictions, his full and complete post-incident cooperation with law enforcement, and his willingness to accept complete responsibility for his actions.
http://fifthdown.blogs.nytimes.com/2...lworths-money/