Herron originally joined the Patriots as an undrafted free agent out of LSU, signing a year ago. New England waived him out of the 2018 preseason.
He signed with the Seahawks’ practice squad Sept. 3 but lasted only a week in Seattle.
The Patriots signed him to their practice squad Oct. 8.
Herron, 24, has never played in a regular-season game.
He made 67 tackles, two sacks, three forced fumbles and a fumble recovery in his four-year career at LSU after redshirting in 2013.