Here's a statement from the Ontario County (New York) Sheriff's Office: Investigation complete.

"The Ontario County Office of Sheriff has completed its investigation into the death of Kevin A. Ward, Jr., which occurred August 9, 2014, at the Canandaigua, New York, Motorsports Park."

"The entire thorough investigation, including a forensic video enhancement recently received from the New York State Police Laboratory in Albany, has been submitted to the Office of the Ontario County District for review."

"The District Attorney's Office, which has been meeting throughout the investigative process with members of the Sheriff's Office, will make a statement late next week advising what action will be taken regarding the investigation."
Philip C. Povero, Sheriff ,Ontario County, New York(9-11-2014)

Source: USA Today Sports