According to the Hillsborough County Sheriff's Office report, Robert Allan Winsor, 24, of 15427 Plantation Oaks Drive No. 2, turned himself in at around 9 p.m.
The report notes that a caller who had heard about the death through news media coverage stepped up with information about the location of a vehicle that matched the description of the fleeing car, a 2013 black Chrysler 300.
"Damage to Winsor's vehicle was consistent with the crash and the vehicle was impounded," according to the sheriff office's report. "Deputies continued working the case in an effort to establish who was operating the vehicle at the time of the crash."
That investigation led to a warrant issued for the arrest of Winsor, who faces charges of leaving the scene of a crash with death and tampering with evidence.
According to earlier reports, the hit-and-run occurred shortly after 11 p.m., when Grimes, of Natrona Court, was walking her dog west across Providence Road within the crosswalk at Providence Ridge Boulevard.
She reportedly was struck in the median-through lane by a Chrysler 300 occupied by at least three people. "The vehicle did not stop, fleeing the scene south of Providence Road," continues the report, issued by Hillsborough County Sheriff's Office spokesperson Debbie Carter.
The car had reportedly lost its driver’s side mirror during the incident and had "damage to its hood and, likely, its windshield, too."