A high-speed chase and gun battle between Grass Valley Police officers and a suspect ended in the man’s death by his own hand, Nevada County District Attorney Cliff Newell announced Thursday. It had been more than six months since Rod Dankers’ death just off Highway 174, southeast of Grass Valley on a service road under the Bear River Bridge. But Newell just received the final forensics report from the California Department of Justice crime lab this week, he said. “I was very hesitant to announce that it was suicide. I needed absolute confirmation,” Newell said. “Dankers’ death was determined to …