Barney: Prior to portraying Jerry Seinfeld's father, Morty, on the hit TV series, Barney Martin was a New York City Police Department detective.
Bat: Bartholomew "Bat" Masterson, a colleague of Wyatt Earp, was a sheriff and a deputy U.S. marshal but made his living as a saloonkeeper and gambler.
Daniel: Dan White, assassin of San Francisco Mayor George Moscone and San Francisco City Supervisor Harvey Milk, was a veteran and police officer before becoming "The Most Hated Man in San Francisco."
Daryl: Daryl (born Darrel) Gates was the chief of the Los Angeles Police Department from 1978 to 1992 and co-credited with the creation of S.W.A.T. and D.A.R.E.
David: New Orleans police Chief David Hennessy was assassinated by members of the Provenzanos crime family in 1890.
Dennis: Former Chicago police officer Dennis Farina played Lieutenant Mike Torello on TV's Crime Story and N.Y.P.D. Detective Joe Fontana on Law & Order.
Donnie: His real name was Joseph Pistone, but we know him as Donnie Brasco, the undercover FBI agent who infiltrated the Bonanno crime family.
Eddie: American singer/guitarist Eddie Money left the N.Y.P.D. training program to pursue a music career.
Edgar: The first director of the F.B.I. was J. Edgar Hoover, who served from 1935 to 1972.
Eliot: Law enforcement official Eliot Ness enforced Prohibition as the head of "The Untouchables," the group that brought down Al Capone.
Erik: After starring as "Ponch" in the TV series CHiPs, Erik Estrada went on to become a full-time deputy sheriff in Bedford County, Virginia.
Forrest: UFC Light Heavyweight Champion Forrest Griffin is a former Georgia police officer.
Frank: Al Pacino was Francesco Serpico in the 1973 film Serpico, which was about the N.Y.P.D. officer who blew the whistle on police corruption.
Gene: Star Trek creator, Eugene "Gene" Roddenberry, worked for the L.A.P.D. before he was able to earn a living as a television screenwriter.
Geraldo: TV talk show personality Geraldo Rivera was an investigator for the N.Y.P.D.
Gerard: While serving as a Martin County, Florida, sheriff's deputy, Gerard John Schaefer, Jr., was a serial killer responsible for anywhere from two to more than 30 homicides.
Jacob: U.S. Capitol Police Officer Jacob Chestnut, killed in the line of duty in 1998, was the first African American to lie in honor in the Capitol. He is buried in Arlington National Cemetery.
James: James E. Davis was a NYC police officer who was killed by a political rival in New York City Hall. Another policeman named Jim — James Dougherty — was the first husband of Marilyn Monroe.
Kenny: Kenny Washington was the first African American to sign a contract with the NFL. After retiring from football, Washington became a distinguished police officer for the L.A.P.D. (Another famous Kenny also worked for the L.A.P.D.: actor Ken Osmond, also known as Eddie Haskell on Leave It to Beaver.
Ray: Raymond Kelly spent 47 years in the NYPD and was police commissioner from 1992 to 1994 and 2002 to 2013.
Richard: Chicago police officer Richard Cain was a "made man" in the Chicago Outfit and a paid associate of Mafia boss Sam Giancana.
Theodore: Before he was the 26th president of the United States, Theodore Roosevelt was the New York City police commissioner.
Tony: President of the Family Research Council, Anthony Perkins was a police officer before becoming the outspoken figurehead of the Christian right wing.
Wyatt: As in Wyatt Earp, of course. Earp was the Tombstone, Arizona, deputy marshal who took part in the "Gunfight at the O.K. Corral."
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