The Patriots also waived LB Cassh Maluia and LB Michael Pinckney.
Rohrwasser, 24, is a former fifth-round pick of the Patriots back in 2020. He signed a four-year deal worth a projected $3.6 million, but was waived coming out of training camp.
The Patriots later re-signed Rohrwasser to their practice squad.
In two years at Marshall, Rohrwasser made 33-42 field goal attempts (78.6 percent) and 79-82 extra points attempts.