A "security hold."? Now that sounds intresting. You had a crash, seems to me once the members of the family of the deceased are notified we should have the names of those involved even though there may be an ongoing investigation into the cause of the crash?
It might be enlightening to determine who actually owned the car. Was it the driver or his passenger? Is it possible the car was the property of a drug dealer confiscated and impounded under asset forfeiture policies, and a couple of officers decided to take it for a joyride?