Investigators are working to learn what happened to a Grove man whose body was found in the Neosho River December 31, 2013.
A land surveyor discovered the body of Andrew Joel Olsen in a tributary of the river, east of Fairland. The Oklahoma State Bureau of Investigation is investigating Olsen's death as suspicious.
"So far, investigators have not found anyone who saw Olsen after November 7, 2013," a news bulletin from the OSBI states.
Agents ask that anyone who saw or spoke to the 27-year-old Olsen after that date to come forward.
Weather conditions at the time Olsen's body was discovered have made it difficult for the medical examiner to provide a date of death, according to the OSBI.
If anyone has information that can help in the investigation, call the OSBI hotline at 1-800-522-8017.