(TMZ) "Empire" star Adam Rodriguez thinks Steven Avery, the man at the center of "Making A Murderer" ... should be set free, and President Obama needs to make it happen.

Adam was leaving the gym Monday in Venice when he unloaded on a TMZ photog about the Netflix documentary. Adam says you can count him among the 250k people who've signed a Change.org petition asking Obama to give Avery a presidential pardon.

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