DC COMICS: DC TV Universe Bio Shrapnel

DC TV Universe: Arrow

Mark Scheffer, also known as Shrapnel, is a former toy shop owner and serial bomber. He terrorized Starling City and endangered the life of Sebastian Blood, before being stopped by The Arrow. He was later enlisted into the Suicide Squad by Amanda Waller but after disobaying orders was killed by a bomb implanted in his head.

ARROW S2: Blast Radius
He is seen as an anti-government serial bomber who follows a militia group and the group's M.O. is how he is identified by Team Arrow when they analyze the bomb remains given by Detective Lance. He goes by the alias of Shrapnel but does not appear visually or physically as Shrapnel. After bombing two government buildings in Starling, Shrapnel targets Sebastian Blood's Unity Rally, he shoots Diggle and after a brief chase, The Arrow manages to catch him and he's arrested.

ARROW S2: Suicide Squad
He joins Amanda Waller's Suicide Squad but eventually attempts to escape only to be blown up by Waller who implanted an explosive chip in his head.