SEMINOLE COUNTY, Okla. - Authorities are searching for a piece of evidence after a man's body was found near an Oklahoma highway.
On Sunday, officials say 41-year-old Thanakrit Thuetong was found dead off Hwy 56 near I-40.
Thuetong, originally from Thailand, has lived in the United States since 2012. Officials say his last known address was in Florida.
While investigating Thuetong's death, agents with the Oklahoma State Bureau of Investigation determined that he parked his car in the parking lot of a Seminole County convenience store on Friday afternoon.
Surveillance video shows him inside the store with a black backpack before walking out of the store, past his car and along the highway.
His body was found approximately a half mile from the store.
However, that black backpack is still missing.
Officials with the OSBI say they are asking whoever took the backpack to return it, since it may contain clues to what led to Thuetong's death.
Agents say they are only interested in the backpack, not the person who took it or why it was taken.
Officials say it is possible Thuetong was driving along I-40 from Florida to California.
The medical examiner is waiting on toxicology results before determining his manner of death.
If anyone has information on the backpack on Thuetong’s death, call the OSBI hotline at 1-800-522-8017