Outlaw and gunfighter.
Billy the Kid (born Henry McCarty September 17 or November 23, 1859 – July 14, 1881, also known as William H. Bonney) was an American Old West outlaw and gunfighter who killed eight men before he was shot and killed at age 21.
He took part in New Mexico's Lincoln County War, during which he allegedly committed three murders.
McCarty was orphaned at age 14. The owner of a boarding house gave him a room in exchange for work. His first arrest was for stealing food at age 16 in late 1875. Ten days later, he robbed a Chinese laundry and was arrested, but he escaped only two days later. He tried to stay with his stepfather, and then fled from New Mexico Territory into neighboring Arizona Territory, making him both an outlaw and a federal fugitive. In 1877, McCarty began to refer to himself as "William H. Bonney".
After murdering a blacksmith during an altercation in August 1877, Bonney became a wanted man in Arizona Territory and returned to New Mexico, where he joined a group of cattle rustlers. He became a well-known figure in the region when he joined the Regulators and took part in the Lincoln County War. In April 1878, the Regulators killed three men, including Lincoln County Sheriff William J. Brady and one of his deputies. Bonney and two other Regulators were later charged with killing all three men.
Bonney's notoriety grew in December 1880 when the Las Vegas Gazette in Las Vegas, New Mexico, and The Sun in New York City carried stories about his crimes.
Sheriff Pat Garrett captured Bonney later that month. In April 1881, Bonney was tried and convicted of the murder of Brady, and was sentenced to hang in May of that year. He escaped from jail on April 28, 1881, killing two sheriff's deputies in the process and evading capture for more than two months. Garrett shot and killed Bonney—aged 21—in Fort Sumner on July 14, 1881. During the following decades, legends that Bonney had survived that night grew, and a number of men claimed to be him.
Source: Wikipedia, "Billy the Kid", available under the CC-BY-SA License.