Tulsa police are investigating after a body was found by pedestrians in front of the BOK Center early Friday morning.Police were called to the area just before 4 a.m. to check on a body in the grass just off the sidewalk.Officers said they found a 57-year-old black male, deceased, with no obvious signs of trauma to the body.The medical examiner is now working to determine a cause of death.The man's identity has not been released pending notification of family.