Frank C. Stilwell (1856 – March 20, 1882) was an
outlaw Cowboy who killed at least two men in
Cochise County during 1877–82. Both killings were considered to have been self-defense. For four months he was a deputy sheriff in
Tombstone,
Arizona Territory for Cochise County Sheriff
Johnny Behan. Stilwell owned interests in several mines and various businesses, including a saloon, a wholesale liquor business, a stage line, and at his death
livery stables in
Charleston and
Bisbee. He was also a partner in a Bisbee area saloon with ex Texas Ranger
Pete Spence.