Before Season 1Edit
Margos had just returned from a trip to Peru when he was arrested with several of his associates during a drug deal. He killed one of the associates just as the Strike Team broke in. He was brought to the Barn for questioning but refused to say a word to Dutch Wagenbach. After he was taken down to the cage, he did say something in Armenian, he says "Delicious feet." to Officer Danny Sofer.
Later, he killed another prisoner by breaking his neck, which prompted Captain David Aceveda to have him transferred. However, he escaped by jumping out of a moving prison van. During transfer, Dezerian managed to trick the door to the van open and jumped out, all while still handcuffed.("Blowback")
Before Season 3Edit
While in Greece, Margos ordered one of his soldiers, Lyor Slavok, to find and kill whoever was responsible for the theft of the Armenian Money Train. After Lyor murdered two Armenian suspects, he packed and sent their feet to Margos in Greece. However, when the police found about it, the package was rerouted to the Barn.("Playing Tight")
After the Strike Team stole millions of dollars from the Armenian Might's money laundering operation, Margos's bosses ordered him to find and murder the people responsible. Margos then left a trail of grisly murders, first two Armenian mobsters, then Diagur Leyva and finally Neil O'Brien (a man who found marked money), amputating the feet of his victims to indulge a foot fetish. Margos also kidnapped Sosi, a young Armenian girl, as insurance. Once he was located by the Strike Team, he stabbed her in the back of the neck and left her for the Team to find. Vic Mackey decided to bring the dying girl to the emergency room, which allowed Margos to escape.
Vic decided to murder Margos before he could target the Team and spread the word that an Armenian Might associate (Goma Magar) planned to become an informant. When Margos went to Goma's house to kill him, Vic ambushed him at gunpoint.
After Margos dropped his gun and surrendered, Vic shot him dead and rigged the crime scene evidence to look like self-defense.
After Season 3Edit
In the events following Lem's demise, Margos' profile with his photographic image and specific information is used alongside others, including, but not limited to Rondell Robinson and Terry Crowley by Shane to create a list of blackmail against Vic Mackey as a backup in case Mackey decided to go against Shane in the future.
In the final season, Vic Mackey admits to all his deeds in the past, including the murder of Margos Dezerian in order to obtain immunity from his crimes.
- The list of items found at Margos Dezerian's house was: more than a hundred maps, six dictionaries in five languages, scanner, digital camera, GameBoy, incense, meditation books, disposable diapers, and a case of microwave popcorn. He didn't have a microwave, fridge, stove, plates, soap, or toilet paper.("Blowback")
Pilot · Our Gang · The Spread · Dawg Days · Blowback · Cherrypoppers · Pay in Pain · Cupid & Psycho · Throwaway · Dragonchasers · Carnivores · Two Days of Blood · Circles ·