Frank Blackhorse

Jumping Bull Compound shootout Blackhorse was named a suspect in the RESMURS (a portmanteau of Reservation Murders), the name assigned to the investigation into an incident involving a shootout at Jumping Bull Compound and resulting in the murder of two FBI special agents: Jack Coler and Ronald Williams. Blackhorse was wanted by the FBI.

Aftermath Leonard Peltier, along with Blackhorse, were arrested by the Royal Canadian Mounted Police in Hinton, Alberta, Canada

Reports about their extradition to the United States, are conflicting, some say both were extradited, but others state only Peltier was. but charges against Blackhorse related to the RESMURS were dropped. Several sources report that Blackhorse was never extradited. The book Mi Taku'ye-Oyasin: The Native American Holocaust, Volume 2 indicated that Blackhorse fled the United States shortly after witnessing and/or participating in the murder of civil rights activist Ray Robinson and had remained in Canada "under various aliases."

Current whereabouts While his last known location was in Edmonton, Alberta, Canada, Blackhorse's whereabouts are unknown. According to the book When Will We Ever Learn, Blackhorse disappeared after not being charged in connection to RESMURS. One source indicates that Blackhorse was allowed to "disappear never to be heard from again." Antoinette Nora Claypoole, the author of the Who Would Unbraid Her Hair: the Legend of Annie Mae, a book that explores the events leading up to the murder of Anna Mae Pictou-Aquash and attempts to pinpoint the identity of her murderer, indicated that Blackhorse had disappeared shortly after Peltier's arrest in Canada in 1976.

On 13 May 2004, Kuzma filed an application with the U.S. Department of Justice to obtain the records in its possession pertaining to Blackhorse. On February 10, 2012, on Kuzma's behalf, Peter A. Reese, an attorney who provided assistance to Kuzma in the latter's unsuccessful attempt to secure the release documents via a Freedom of Information request, submitted on documents related to Blackhorse. Another attorney, Daire Brian Irwin, filed a suit in the US District Court in Buffalo, New York, sought an order directing the Justice Department to release the requested records of Blackhorse. Kuzma has also claimed that Blackhorse was an FBI operative sent to infiltrate the ranks of thae Aim and win the trust of its members.