Question: Cassius M. "Cash" Hollister (December 7, 1845 – October 18, 1884) was a 19th-century American law enforcement officer and deputy U.S. marshal who served as mayor and sheriff of which city in Kansas, during his career, he worked with several well-known lawmen including Henry Newton Brown (1857 – April 30, 1884) was an American Old West gunman who played the roles of both lawman and outlaw during his life?

Context articles: List of Old West gunfighters
Broome County Sheriff's Office
Henry Newton Brown
Wyatt Earp
Lake County Sheriff's Office (Florida)
Cassius M. Hollister
James Timberlake
Jim Miller (outlaw)
Paden Tolbert
Law enforcement officer

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.
The Broome County Sheriff's Office (BCSO), is the primary law enforcement agency for unincorporated areas of Broome County, New York, New York, United States.
 As a constitutional officer the Sheriff is the chief law enforcement officer within his County.
 While operating primarily in the unincorporated areas of the County, the Sheriff's Office does have jurisdiction within the City of Binghamton and various incorporated towns and villages.
 The current sheriff is David E. Harder.
 Sheriff Harder joined the Sheriff's Office in 1961 as a Deputy Sheriff.
Henry Newton Brown (1857 – April 30, 1884) was an American Old West gunman who played the roles of both lawman and outlaw during his life.
Wyatt Berry Stapp Earp (March 19, 1848 – January 13, 1929) was an American Old West gambler, a deputy sheriff in Pima County, and deputy town marshal in Tombstone, Arizona Territory, who took part in the Gunfight at the O.K. Corral, during which lawmen killed three outlaw cowboys.
 He is often mistakenly regarded as the central figure in the shootout in Tombstone, although his brother Virgil was Tombstone city marshal and deputy U.S. marshal that day, and had far more experience as a sheriff, constable, marshal, and soldier in combat.
The Lake County Sheriff's Office is largest law enforcement agency in Lake County, Florida, United States.
 Per the State of Florida Constitution, the sheriff is the chief law enforcement officer of both the incorporated and unincorporated areas of the county.
 The current Sheriff is Peyton C. Grinnell who was elected November, 2016 in the Lake County general election.
 He succeeds Sheriff Gary Borders, who was appointed by Governor Jeb Bush following the death of Sheriff Chris Daniels in 2006, and was subsequently elected in 2008, and 2012.
 The agency has been awarded with a certificate of accreditation from the Commission for Florida Law Enforcement Accreditation, consequently, both the Law Enforcement and Corrections divisions of the Lake County Sheriff's Office are now accredited.
Cassius M. "Cash" Hollister (December 7, 1845 – October 18, 1884) was a 19th-century American law enforcement officer and deputy U.S. marshal who served as mayor and sheriff of Caldwell, Kansas as well as deputy sheriff of Sumner County from 1879 until his death in 1884.
 During his career, he worked with several well-known lawmen including Henry Brown and Ben Wheeler, who together were active against horse thieves in southern Kansas.
James H. Timberlake (March 22, 1846 – February 21, 1891) was an American law enforcement officer, Civil War soldier, farmer and rancher who served as a deputy U.S. marshal for the Western District of Missouri.
 Timberlake is best known for being the chief enforcer and investigator against the James-Younger Gang, beginning in the 1870s, which culminated in the death of the outlaw Jesse James on April 3, 1882, at the hands of Robert Ford.
James Brown Miller (October 25, 1861 – April 19, 1909), also known as "Killin' Jim", "Killer Miller" and "Deacon Jim", was an American outlaw and assassin of the American Old West said to have killed 12 people during gunfights – perhaps the most of his era.
 Miller was referred to by the alias Deacon Jim by some because he regularly attended the Methodist Church and he did not smoke or drink.
 He was lynched by a mob of angry citizens because of his assassination of a former deputy U.S. marshal.
Paden Tolbert (c. 1863 or 1870 – April 24, 1904) was a 19th-century American law enforcement officer and railroad agent.
 He was one of the leading deputy U.S. Marshals in the Indian Territory during the 1880s and 90s and often worked with other well-known lawmen of his time including Bud Ledbetter, Heck Thomas and Bill Tilghman.
 He and his brother John Tolbert were both deputy marshals under "The Hanging Judge" Isaac Parker.
A law enforcement officer (LEO) or peace officer, in North American English, is a public-sector employee whose duties primarily involve the enforcement of laws.
 The phrase can include police officers, municipal law enforcement officers, special police officers, customs officers, state troopers, special agents, special investigators, border patrol officers, immigration officers, court officers, probation officers, parole officers, arson investigators, auxiliary officers, game wardens, sheriffs, constables, corrections, marshals, deputies, and Public Safety Officers (at public institutions).
 Security guards are civilians and therefore not law enforcement officers, unless they have been granted powers to enforce particular laws, such as those accredited under a Community Safety Accreditation Scheme.
 Although typically the term "law enforcement officer" refers to those government agents with police powers, prosecutors are also law enforcement officers.