PITTSBURGH -- Pittsburgh Steelers defensive end Cam Heyward has embraced his role as a leader over the last few seasons, filling a void left by the retirements of Brett Keisel, Casey Hampton and Aaron Smith. Hes become a voice of reason in the locker room and a mentor to youngers Stephon Tuitt and Javon Hargrave.Now its time to see if the kids can make it on their own.Coach Mike Tomlin declared Heyward out for Sundays game at Miami, thanks to a left hamstring injury, meaning the Steelers (4-1) will play without Heywards familiar No. 97 in the lineup for the first time since he was taken with the 31st overall pick in the 2011 draft.Heyward was injured in the first half of last Sundays 31-13 win over the New York Jets and underwent an MRI to determine the extent of the damage. Tomlin declined to get into specifics about how much time Heyward might miss, though the chances of him returning by an Oct. 23 showdown with New England seem bleak.He doesnt fall in the realm of whats normal in everything he does, Tomlin said.Making Heyward difficult to replace for a variety of reasons. His three sacks led the team, all of them coming in a romp over Kansas City on Oct. 3 following a whipping in Philadelphia that Heyward blamed almost entirely on the defensive front. He responded with the best statistical game of his career. Tomlin hinted its unlikely the Steelers will use just one player in Heywards spot, likely rotating out Hargrave, a rookie, and veteran Ricardo Matthews.Hargrave, drafted as a nose tackle, spent time on the end against the Jets, with positive results, while Matthews impressed Tomlin with his aggressiveness.Hes got a motor, Tomlin said. Hes highly conditioned for a guy of his size. Those are things we like.Perhaps, but the role of communicator along the line will fall to Tuitt. Now in his third year, hes reveled in being mentored by Heyward. Their lockers are a handful of stalls apart after Heyward migrated from his previous spot next to Ben Roethlisberger. Asked recently if he spends a lot of time in the playbook, Tuitt joked he gets the game plan from Heyward and goes from there.Now its Tuitts turn to do the talking. Asked after the victory over the Jets if Tuitt is ready to take on the role, Heyward laughed.He better be ready, Heyward said. I dont know how long Ill be out. But hes got to step up. Hes telling me hes talking a lot more and we need him to do that. When I come back, we can do that twice as much. Hes only going to grow in this situation.The early returns were promising. The Jets managed just 100 yards in the second half as Pittsburgh pulled away for a relatively easy victory.Game notes Safety Shamarko Thomas (groin) and backup offensive lineman Cody Wallace (knee) are also out for Miami. ... Tomlin said hell wait to see how the week goes before deciding the status of right tackle Marcus Gilbert (left ankle), wide receiver Markus Wheaton (shoulder), linebacker Ryan Shazier (knee), cornerback Justin Gilbert (knee) and safety Robert Golden (hamstring).---Online:AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL Kevin Gausman Jersey . Bjorn, who had a 36-hole total of 8-under 134, made a testing six-foot putt to save par on the 16th and a birdie on the 17th before bogeying the final hole after a misjudged approach shot. American Kevin Streelman was in second place after shooting a 69. Craig Gentry Jersey . 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