(Darke County, OH)--Details of a fatal dirt bike accident have been released.  According to the Darke County Sheriff’s Office, two dirt bikes traveling in opposite directions on Richmond-Hollansburg Road collided.  21-year-old Ian Dixon of Hollansburg was pronounced dead at the scene.  19-year-old Kasyn Hollinger sustained serious, life-threatening injuries.  Friends of Hollinger indicated online Sunday night that he has now also died, although that had not been confirmed by law enforcement by 6 a.m. Monday.  Alcohol, speed, and the fact that neither rider was wearing a helmet were all cited as contributing factors.