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"Oz," a groundbreaking HBO drama series that aired from 1997 to 2003, featured Christopher Meloni in the captivating role of inmate Chris Keller. Set within the walls of a maximum-security prison, the show delved into the complex lives and relationships of its diverse inmate population, with Keller emerging as a charismatic yet morally ambiguous character whose journey proved both compelling and thought-provoking.