You need to locate any obits that might be out there. Also, look for a death certificate. Find out where Tony was buried and maybe the cemetery or funeral home has some information. Maybe there was a newspaper article on the car crash. Request Tony's military records, there will be family history in there.
Tew is not a common name. Have you tried contacting the "Tew's" in NC and see if there is any relation?
This is something that you need to do. You did not put much information in your posting for much other help.
Good
Hunting,
Frank