Herron signed a futures contract with the Patriots on Tuesday, Mike Reiss of ESPN.com reports.
Herron spent all of his rookie season on the Patriots' practice squad in 2018. He'll look to earn a role as a depth defender and special teams player in 2019.
The Patriots released Herron on Saturday, Doug Kyed of NESN.com reports.
The undrafted rookie will look to make the team's practice squad.
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