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The Cardinals signed Whiteheart to their active roster Tuesday, Darren Urban of the team's official site reports.
The move coincides with Arizona placing tight end Zach Ertz (quadriceps) on injured reserve. Whiteheart joined the Cardinals' practice squad on Sept. 1, one day after being let go by the team ahead of the 53-man roster deadline. With Ertz sidelined for at least the next four games, Whiteheart will provide depth at tight end behind Trey McBride, Geoff Swaim and Elijah Higgins.
