Billy Porter (criminal)

Billy Porter
An illustration of Billy Porter from "Recollections of a New York Chief of Police" (1887)
Born	William O'Brien c. 1850 Boston, Massachusetts, United States
Nationality	Irish-American
Other names	Billy Morton, Billy O'Brien
Occupation	Criminal
Known for	Burglar and underworld figure in New York City during the late 19th century; member of the Dutch Mob.
Height	5 ft 5+1⁄2 in (1.66 m)

William O'Brien (1850 – unknown), better known as Billy Porter but also known by the alias William or Billy Morton, was an American burglar and underworld figure in New York City during the mid-to late 19th century. He and partner Johnny Irving were longtime members of the Dutch Mob along with Little Freddie and Michael "Sheeny Mike" Kurtz. He was present during the 1883 gunfight at Shang Draper's saloon in which Irving was shot and killed by rival John "Johnny the Mick" Walsh. O'Brien then killed Walsh and was himself gunned down by Shang Draper. Although surviving his wounds, he was tried for, and acquitted of, Walsh's death.

Like many of the Dutch Mob, O'Brien was also associated with the infamous bank robber George Leonidas Leslie and his gang. Nearly a year after the Walsh murder trial, he was among those suspected of Leslie's murder in 1884. He was among those profiled in Thomas F. Byrnes's Professional Criminals of America (1886).