WHO is ELECTROCUTIONER

So there is a big possibilty that Electrocutioner might have some history with BATMAN

HEY THERE!!! sorry got up into something cant able to follow up the last assassin well now we all know that ELECTROCUTIONER is our last assassin who is he?? 

The Electrocutioner is a super-villain who uses lightning-based abilities to act as a criminal for hire. There have been several men to use the alias. His powers are not natural, they are generated by electrical circuitry in his suit. He has been associated with the Secret Society of Super-Villains and the Suicide Squad. Electrocutioner was created by Marv Wolfman, Michael Fleisher and Irv Novick, first appearing in Batman#331. (1981) 

Unnamed Buchinsky

Lester Buchinsky's unnamed brother was the first Electrocutioner. Although very less is told about him but Lester would take over the identity later. Unrevealed The second Electrocutioner used a costume rigged to generate a lethal electrical shock against criminals (including Cannon and Saber). He was later killed by Vigilante (Adrian Chase). An undead version of him was called forth by Circe during a battle between her and Earth's heroes.

Lester Buchinsky

Initially working in the cause of justice just like the first Electrocutioner, Lester Buchinsky became a criminal and mercenary. Overly reliant on his ability to generate electricity, the Electrocutioner 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, Spoiler works to oppose him. Ironically, Spoiler would prove to be Cluemaster's daughter. The stupidity of Lester's second partner, a hulking brute with delusions of intelligence, would also hamper their plans. For a time, Lester was frequently seen in the employ of Blüdhaven crime boss Blockbuster.

In Infinite Crisis, Lester became a member of the Secret Society of Super Villains.

During the 34th week of the series 52, Electrocutioner appear as part of a Suicide Squad operation against Black Adam.

So there is a big possibilty that electrocutioner might have some history with batman lets see.