HBO Series ‘Perry Mason’ Adds ‘Marriage Story’ & ‘Blue Bayou’ Actor Mark O’Brien

EXCLUSIVE: Actor and filmmaker Mark O’Brien is set to star in season 2 of HBO’s Perry Mason in the recurring guest star role of Thomas Milligan. Thomas is Los Angeles’ ambitious Deputy District Attorney. He’s described as an aggressive attack dog in court as he strives to make his mark and ascend to greater heights…
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