Question: What American actor know for his striking resemblance to silent film hero Rudolph Valentino played American Old WEst gunfighter Billy the Kid?

Context paragraphs:
John Gilbert (actor): John Gilbert (born John Cecil Pringle; July 10, 1899 – January 9, 1936) was an American actor, screenwriter and director.  He rose to fame during the silent film era and became a popular leading man known as "The Great Lover".  At the height of his career, Gilbert rivaled Rudolph Valentino, another silent film era leading man, as a box office draw.

The Son of the Sheik: The Son of the Sheik is a 1926 American silent adventure/drama film directed by George Fitzmaurice and starring Rudolph Valentino and Vilma Bánky.  The film is based on the 1925 romance novel of the same name by Edith Maude Hull, and is a sequel to the 1921 hit film "The Sheik", which also stars Rudolph Valentino.  "The Son of the Sheik" is Valentino's final film and was released nearly two weeks after his death from peritonitis at the age of 31.

Camille (1921 film): Camille is a 1921 American silent drama film starring Alla Nazimova as Marguerite and Rudolph Valentino as her lover, Armand.  It is based on the play adaptation "La Dame aux Camélias" ("The Lady of the Camellias") by Alexandre Dumas, "fils", which was first published in French as a novel in 1848 and as a play in 1852.  "Camille" is one of numerous screen adaptations of Dumas, "fils"' story.  The film was set in 1920s Paris, whereas the original version took place in Paris in the 1840s.  It had lavish Art Deco sets and Rudolph Valentino later married the film's art director, Natacha Rambova.

Anthony Dexter: Anthony John "Tony" Dexter (January 19, 1913 – March 27, 2001) was an American actor known for his striking resemblance to silent film hero Rudolph Valentino, whom he portrayed in the 1951 biographic "Valentino".  Dexter sometimes used the pseudonym Walter Craig.  He was known for portraying many real-life characters such as Captain John Smith, Captain William Kidd, Billy the Kid and Christopher Columbus.

When Love Grows Cold: When Love Grows Cold is a lost 1926 silent film drama directed by Harry O. Hoyt, and starring Clive Brook and Natacha Rambova in her only screen starring performance.  Rambova was chiefly famous for being the wife of Rudolph Valentino.  The film was originally titled "Do Clothes Make the Woman?"  But in view of Valentino's recent divorce from Rambova, the distributor took the opportunity to bill her as 'Mrs Valentino' and changed the title to "When Love Grows Cold".  She was mortally offended and never worked in film again.

List of Old West gunfighters: This is a list of Old West gunfighters, referring to outlaws or lawmen, of the American frontier who gained fame or notoriety during the American Wild West or Old West.  The term "gunslinger" is a modern, 20th-century invention, often used in cinema or other media to refer to men in the American Old West who had gained a reputation as being dangerous with a gun.  A gunfighter may or may not be an outlaw or a lawman.  An outlaw had usually been convicted of a crime, such as Black Bart, but may have only gained a reputation as operating outside the law, such as Ike Clanton.  Some of those listed may have also served in law enforcement, like Marshal Burt Alvord who subsequently became an outlaw, and some outlaws like Johnny Ringo were deputized at one time or another.  Some of the gunfighters listed included professional scouts, businessmen, and even doctors.

Dallas Stoudenmire: Dallas Stoudenmire (December 11, 1845 – September 18, 1882) was an American Old West gunfighter and lawman who gained fame for a brief gunfight that was later dubbed the "Four Dead in Five Seconds Gunfight".  His name is lesser known than many others from the Old West called "gunfighters", though it is becoming more prominent.  Hollywood briefly considered a movie of him, but it has yet to materialize.  Stoudenmire had a deadly reputation in his day and was involved in more gunfights than most of his better-known contemporaries, such as John Selman, Wyatt Earp, Bat Masterson, Elfego Baca, Luke Short, and Doc Holliday.

Luke Short: Luke L. Short (January 22, 1854 – September 8, 1893) was an American Old West gunfighter, cowboy, U.S. Army scout, dispatch rider, gambler, boxing promoter and saloon owner.  He survived three gunfights, one against Charlie Storms in Tombstone, Arizona Territory and two in Fort Worth, Texas against Jim Courtright and Charles Wright.  Short had business interests in three of the most well-known saloons in the Old West: the Oriental in Tombstone, the Long Branch Saloon in Dodge City, and the White Elephant in Fort Worth.

Billy the Kid: Billy the Kid (born Henry McCarty, and also known as WilliamH.Bonney; 1859July 14, 1881) was an American Old West gunfighter who participated in the New Mexico Territory's Lincoln County War of 1878.  He is known to have killed eight men.

Stolen Moments (film): Stolen Moments (1920) is a silent film starring Marguerite Namara with Rudolph Valentino playing a villain, the last film in which he played one.  It was released in December 1920, just a few months before Valentino was elevated to stardom by his performance in "The Four Horsemen of the Apocalypse" (released 6 March 1921).  In fact, filming of "Stolen Moments" was expedited so that Valentino could make it to Hollywood before filming began on "The Four Horsemen of the Apocalypse".

Supporting paragraphs: Anthony Dexter Billy the Kid
Answer: Anthony John "Tony" Dexter