Big Island police have opened a murder investigation, after the human remains found in South Kohala Monday have been identified as 37-year-old Robert Keawe Lopaka Ryder of Kailua-Kona. The local musician was reported missing in January by his family, who hadn't seen him since Thanksgiving. Officers were led to Ryder's remains by a man who confessed he was involved in a murder and could show them where the body was buried. Detectives recovered remains in a vacant lot between Queen Kaahumanu Highway and Puako Beach Drive. The alleged accomplice claimed he was coerced into helping another man corner Ryder and later helped in disposing of Ryder's body. The Medical Examiner determined the cause of Ryder's death was blunt force trauma to the head and the manner of death was homicide.