Denny Marcin in his office at Giants Stadium in East...

Denny Marcin in his office at Giants Stadium in East Rutherford, New Jersey, in 2003. The former assistant coach died Wednesday, Sept. 20, 2017, at 75. Credit: Richard Harbus

SOUTHPORT, N.C. — Former New York Giants and Jets assistant coach Dennis “Denny” Marcin has died. He was 75.

Marcin had been battling an illness and died Wednesday in Southport, according to an obituary posted on the website for Peacock, Newnam and White Funeral Home.

The gravelly voiced Marcin, known as “the Old Ball Coach” in football circles, coached the Giants’ defensive line from 1997 to 2003. He helped guide the likes of Michael Strahan and Keith Hamilton to New York’s Super Bowl appearance during the 2000 season.

After leaving the Giants, Marcin coached the Jets’ defensive linemen, including Shaun Ellis and John Abraham, from 2004 to 2006.

Marcin, born in Cleveland in 1942, played at Miami University and coached in the high school ranks before returning to his alma mater to coach the RedHawks for four years. He then served as the defensive coordinator at North Carolina, where Lawrence Taylor was one of his stars, from 1978 to 1986 before becoming assistant head coach from 1987 to 1988.

Marcin spent nine seasons at Illinois before joining the Giants’ coaching staff.

He returned to Southport after retiring from coaching, but served in a scouting role with the Jets for several years.

Marcin is survived by his wife, Betsey, sons Jeff and Denny, daughters Melinda and Susan, and six grandchildren.

A funeral Mass will be celebrated Tuesday at Sacred Heart Catholic Church in Southport.

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Free LI State Park admission ... Rebuilding Montauk beach ... Brooklyn pizza tours Credit: Newsday

Juneteenth ... Stony Brook breast cancer research ... Free LI State Park admission ... Suffolk bus camera controversy

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