He wasn't down, but he is retiring: Myles Jack ends NFL career after 7 seasons, NFL insider says
Myles Jack surprisingly retires shortly after joining Eagles
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Eagles place Myles Jack on the Reserve/Retired list
LB Myles Jack informs Eagles he plans to retire after seven NFL seasons
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Myles Jack moving back to outside linebacker, PFF News & Analysis
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Philadelphia Eagles Signings: Myles Jack & Zach Cunningham to 'Raise Level' - Coach Nick Sirianni - Sports Illustrated Philadelphia Eagles News, Analysis and More