- Played by: Brook Yeaton
- Appears in season two: "Collateral Damage"; "Stray Rounds" (uncredited); "Bad Dreams" and "Port in a Storm" (Uncredited).
White Mike is a mid-level East side drug dealer with his own territory. He supplied Ziggy Sobotka with packages of narcotics to distribute but their relationship soured when Ziggy failed to make adequate profit from the package. McArdle was supplied by The Greek's smuggling operation and was arrested as part of an investigation into that operation. He was quick to turn against his suppliers and gave up all the information he had.
Brook Yeaton is also an on set dresser for the show.
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