This secures Heyward for a fifth season.
The Steelers exercised the option prior to a May 3 NFL deadline.
Drafted 31st overall out of Ohio State, Heyward is due a $7.5 million salary.
In 13 starts last season, Heyward recorded 63 tackles, five sacks, five passes defensed, and 31 pressures.
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Aaron Wilson covers the Ravens for The Baltimore Sun