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49ers release Cedric Thornton

Denver Broncos v San Francisco 49ers

SANTA CLARA, CA - AUGUST 9: Defensive Line Coach Jeff Zgonina and Cedric Thornton #63 of the San Francisco 49ers talk on the sideline during the game against the Dallas Cowboys at Levi Stadium on August 9, 2018 in Santa Clara, California. The 49ers defeated the Cowboys 24-21. (Photo by Michael Zagaris/San Francisco 49ers/Getty Images)

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Cedric Thornton’s comeback lasted four months, and unless some other team gives him a chance, it could send the defensive lineman back into retirement.

The 49ers announced Friday they have released Thornton, whom they reinstated off the reserve/retired list in April. He announced his retirement Aug. 22, 2018, after seven years in the NFL.

Thornton never played a down for the 49ers.

Thornton, 31, made 220 tackles, 7.5 sacks, six passes defensed, four fumble recoveries and two forced fumbles with Philadelphia, Dallas and Buffalo.

The 49ers announced the signing of tight end Niles Paul, which was reported earlier in the day, as well as that of offensive lineman Dillon Day.

Day originally entered the NFL after signing with the Broncos as an undrafted rookie free agent in 2015. He also has spent time with the Colts and Packers.

Day, 27, has never played a regular-season game.