Electrocutioner

The Electrocutioner is an alias used by three fictional characters in the DC Universe, all minor enemies of the superhero Batman. 
Publication history.
The first Electrocutioner (known only as Buchinsky) appeared in "Batman" #331 (January 1981) and was created by writers Marv Wolfman and Michael Fleisher and artist Irv Novick.
The Electrocutioner II first appeared in "Detective Comics" #626 (February 1991) and was created by Wolfman and artist Jim Aparo.
Lester Buchinsky, the Electrocutioner III, first appeared in "Detective Comics" #644 (May 1992) and was created by writer Chuck Dixon and artists Tom Lyle and Scott Hanna.
Fictional character biography.
Buchinsky.
Buchinsky (first name unknown) is a self-appointed executioner of criminals in Gotham City who uses an electrically charged suit and goes by the name "Electrocutioner". Batman has three encounters with the him. In the first, the Electrocutioner murders killer Mike Caine; in the second, Batman rescues Dane Whitney; in the third, the Electrocutioner falls through a window, grips a metal railing, and shocks himself so that he lets go and plunges off a cliff into the river below.
The Electrocutioner later goes to Manhattan. He encounters two muggers in Central Park and attacks them with lethal doses of electricity from his gauntlets. The Vigilante, meanwhile, continues to cut a bloody swathe of bodies in the name of justice. He breaks into Charles McDade's limousine and shoots McDade and his lady friend Mona Simpson to death. That evening, the Vigilante learns that the Electrocutioner is back in town and is, in fact, targeting the same criminal element that the Vigilante himself is. The Electrocutioner is eventually killed by the Vigilante.
When S.T.A.R. Labs opened a portal to Limbo in Operation Zeppelin, they did this as various deceased criminals wished to return to the earthly realm through the portal. These criminals included the Electrocutioner, the Icicle I, Clayface II, El Papagayo, the Iron Major, and the Top. When Operation Zeppelin's creator Director Jeffrey Simon disappeared, a rescue party went through the portal and the villains captured them. They bargained with their demonic jailer, a demon impersonating Etrigan the Demon, exchanging their prisoners to gain temporary mortal forms and preparing to return to Earth. They were opposed by the Hawk, the Dove, and the Titans West. The battle was fierce, but the tide turned when J.E.B. Stuart came down from Heaven and gave the Hawk his Haunted Tank. The false Etrigan offered them a way out through another portal, but he was merely toying with the dead villains: when he sent them through the portal, it turned out to be an entrance to Hell.
Electrocutioner II.
The second Electrocutioner used a costume rigged to generate a lethal electrical shock against criminals (including Cannon and Saber), and ran afoul of Batman, who disapproved of his extreme justice. His real name was never revealed.
Lester Buchinsky.
Lester Buchinsky is the brother of the original Electrocutioner. Originally fighting for justice just like his brother, he later became a criminal and a mercenary. Overly reliant on his ability to generate electricity, the Electrocutioner III has faced (and been defeated by) Batman, Robin, and Nightwing.
In at least one scheme, working with the Cluemaster to steal an armored car full of money, the Spoiler works to oppose him. The Spoiler turned out to be the Cluemaster's daughter. The stupidity of Lester's second partner, a hulking brute with delusions of intelligence calling himself Czonk the Baffler, would also hamper their plans.
For a time, Lester was frequently seen in the employ of Blüdhaven crime boss the Blockbuster II.
In "Infinite Crisis", Lester became a member of the Secret Society of Super Villains.
During the 34th week of the series "52", the Electrocutioner III appeared as part of a Suicide Squad operation against Black Adam.
In the "Rise and Fall" storyline, the Green Arrow is still hunting the Electrocutioner III and those who worked with Prometheus; keeping secret his murder of the man as the rest of the Justice League tries to track him down. The Green Arrow confronts the Electrocutioner III, who set off the device that devastated Star City in "". He was close to killing the man when the Black Canary stops him during their argument. The Black Canary then realizes what the Green Arrow did; thus, the Electrocutioner III escapes from the Green Arrow's attempt to bring him down. Although the Electrocutioner III was defeated and horrifically injured by Speedy,the Green Arrow's arrival convinces Speedy that killing is not the answer and the two archers take him into custody.
Once the Electrocutioner III awoke from his coma, Roy Harper vowed revenge. He broke into the jail and killed the Electrocutioner III, despite the Green Arrow's protests.
Other versions.
A fourth Electrocutioner appeared briefly in the "" prequel comic. This unnamed Electrocutioner claims to be an underling of Lester Buchinsky and had acquired several of Buchinsky's prototypes and modified them using Wayne Industries technology. The Electrocutioner attacks Batman shortly after the ending of Arkham City, but is quickly defeated due to his arrogance, which Batman notes as the "exact problem with [his] old boss". He is then left there for the GCPD to find, but the Arkham Knight appears and kills him with a shotgun blast to the head.
In other media.
Film.
The Electrocutioner appears in the animated film "", voiced by Robin Atkin Downes. He is among the villains who work for Talia al Ghul. When Electrocutioner was about to kill Robin, he was killed by Damian Wayne's clone Heretic.