Gregory McKinney III, 21, was found dead in a wooded area near 1800 E. Tecumseh in Tulsa, Oklahoma, in the early morning hours of August 9, 2005. Investigators determined he died from a single gunshot wound.

Months earlier Gregory had become the prosecution’s key witness in the double homicide of Ples and Shelly Vann, having given a statement to Tulsa police and testified at a preliminary hearing on October 27, 2004, implicating Robert Fellows and Phillip Summers. Fellows and Summers were charged with two counts of first-degree murder and Gregory was scheduled to testify at their trial. His killing before trial is believed to be linked to his role as a witness, but no arrests have ever been made and the case remains unsolved with the Tulsa Police Department.

Does anyone with information about Gregory or his death have details that could help investigators?