• Procopio Real - Outlaw member Vicente Silva’s White Caps Gang in Las Vegas, New Mexico.

Pablo Realis - An ax murderer who killed his wife and sister-in-law on July 19, 1848, in Santa Fe, New Mexico.

• Len Redfield - A suspected outlaw in Arizona, he was lynched in 1877 for allegedly robbing a stagecoach.

• James Edwin Reed - The son of Belle Starr and Jim Reed, he was a known horse thief and suspected stagecoach and train robber.

• Jim Reed (1845?-1874) - Rode with Quantrill's Raiders during the Civil War. He married Belle Starr, was involved with the James-Younger Gang and Tom Starr's gang. He was killed by a deputy sheriff at Paris, Texas in August 1874.

• Nathaniel Reed "Texas Jack" (1862-1950) - A proficient bank and train robber in Indian Territory, Reed'ss escapades were successful until he was shot and wounded by U.S. Deputy Marshal Bud Ledbetter during an attempted train robbery in 1894. Though he was able to escape, he turned himself in the following year and turning states evidence, served only one year. He lived to the ripe old age of 88, dying in Tulsa, Oklahoma on January 7, 1950.

• Benny Reeves -  The son of U.S. Deputy Marshal, Bass Reeves, Benny was wanted for murder in Oklahoma.

• John Reeves - Outlaw member of the Christian Gang.

• William Reeves - Thought to have been a member of Henry Plummer's gang of Innocents. He was shot and hanged by Montana Vigilantes. 

• Reno Brothers (18??-1868)

• Richard Remine - An outlaw, he was hanged at Silver City, New Mexico in March 1881.

• Laris Reynolds - Outlaw member of Ike Stockton's Gang.

• Adam C. Ricchetti - A bank robber who rode with "Pretty Boy" Floyd, he was put to death in the gas chamber in Jefferson City, Missouri on October 7, 1938.

• Eva Ricchetti-Simpson - The sister of Adam Ricchetti, she was wanted for robbery, forgery, car theft, and child abandonment.

• Barney Kemp Riggs (1856-1902) - A Texas outlaw and gunfighter, he was killed at Fort Stockton, Texas in 190 2.

• Thomas Riley (18??-1868)

• Johnny Ringo [John Ringgold] (1850-1882) - Ringo earned a deadly reputation in numerous gunfights and fought with Scott Cooley in the Mason County War. Later he showed up in Tombstone, Arizona, where he hooked up with the Clanton Gang. Later he was found dead, some say at the hands of Wyatt Earp or Doc Holliday. Judd Roberts (18??-1887)

• Andrew L. Roberts, aka: Buckshot Roberts, Bill Williams (18??-1878) - A Texas Ranger, outlaw, and member of King Fisher's Gang in New Mexico, Roberts heroically stood up against Billy the Kid and the Regulators in 1878 in what's known as Buckshot Roberts Last Stand.

• "Frank Pierce" Roberts -  A bootlegger in Indian Territory, he was the brother-in-law of Pink and Jim Lee and was killed by possemen.

• Ben Robertson, aka: Ben Burton, Ben Wheeler (1854?-1884) - A lawman and outlaw, Robertson, originally from Texas made his way throughout the west until he settled in Kansas, where he went to work for Marshal Henry Brown as a deputy in Caldwell. Excellent lawmen, they suddenly turned outlaw and robbed a bank in Medicine Lodge, Kansas and were lynched on April 30, 1884.

• John Robinson - A black murderer in Oklahoma, he was wounded when captured by U.S. Deputy Marshal Bass Reeves. He died at Fort Smith, Arkansas of his injuries.

• Jesus Rodriguez - A gunman and horse thief, he fought with the Regulators in the Lincoln County War of New Mexico. Afterwards he disappeared.

• William Roe - When ex-lawman Roe committed murder, he was hanged in Grimes County, Texas on May 26 1888.

• Annie Rogers, aka: Della Moore, Maud Williams (18??-19??) - Involved with Kid Curry, Annie was a "member" of Butch Cassidy's Wild Bunch. She was charged with Curry as an accomplice, imprisoned in the Tennessee Penitentiary, and released on June 19, 1902.

• Bob Rogers (1873-1895) An Oklahoma outlaw and leader of the Rogers Brothers Gang during the early 1890's, he murdered a lawman and was later killed by a posse in Horseshoe Mound on March 13, 18 95.

• David Rogers - An outlaw, he was arrested in 1889 for complicity in the robbery of an Army paymaster in the New Mexico Territory.

• Dick Rogers - An outlaw, he attempted to break a friend from jail on March 13, 1885, and was killed.

• Jim Rogers - Brother to Bob Rogers and member of his gang.

• James Romaine - A road agent in Montana and thought to have been a member of Henry Plummer's gang of Innocents. He was hanged by Montana Vigilantes. 

• Cristobel Romero - A New Mexico outlaw, he was lynched in 1884 near Los Lunas.

• Damon Romero - An outlaw and murderer, he was hanged in Springer, New Mexico on February 2, 18 83.

• Juan Romero - Outlaw member Vicente Silva’s White Caps Gang in Las Vegas, New Mexico. He and Sostenas Lucero, killed gang member Antonio Rale. He died in Raton in 1931.

• Ricardo Romero, aka: EI Romo - Was Vicente Silva's first lieutenant in the White Caps Gang in Las Vegas, New Mexico.

• Torevio Romero - A gunman, Romero killed Francisco Martinez on March 25, 1886, in Rio Quemado, New Mexico.

• Kit Ross (1861-1886) - Cherokee Indian outlaw wanted for murder, he was killed by Jonathan Davis.

• E.C. Rucker - Though a New Mexico lawman, he aligned with the outlaw, John Good.

• David Rudabaugh, aka: Dirty Dave (1854-1886) - Better known as an outlaw, Rudabaugh briefly served as a lawman in Las Vegas, New Mexico. However, this was as part of the crooked Dodge City Gang. He rode with the likes of the Roark Gang, Doc Holliday, and Billy the Kid. He was shot and beheaded by vigilantes in Mexico in 1886.

• Bill Rudolph, aka: The Missouri Kid - An outlaw and murderer, he robbed banks in Missouri with George Collins the 1900s, and was captured in 1904 and hanged on May 8th.

• Rufus "Windy” Ruff - An outlaw, he was lynched in Mora County, New Mexico for killing Charles Norton.

• John D. Ruggles (1859-1892) - California stage robber hanged by a vigilante mob on July 24, 1892.

• Charles L. Ruggles (1870-1892) - California stage robber hanged by a vigilante mob on July 24, 1892.

• Matt Rush - A suspected rustler, he was killed by Tom Horn on July 9, 1900, near Brown's Hole, Wyoming.

• "Fatty" Ryan - A robber in Arizona.

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