Running back Gerald Riggs Jr. back with Argonauts

Rhein Fire's running back Gerald Riggs Jr. takes off his helmet during the European football NFL Europe league match between Hamburg Sea Devils and Rhein Fire of Duesseldorf at the AOL Arena in Hamburg, northern Germany, on Sunday, May 6, 2007. (AP Photo/Kai-Uwe Knoth)

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MISSISSAUGA, Ont. -- Gerald Riggs Jr. is hoping the third time is the charm.

The import running back returned to the Toronto Argonauts for the third time Monday, joining the CFL team's practice roster. The move comes a day after the Argos released veteran tailback Cory Boyd.

Sophomore Chad Kackert will start at tailback for Toronto in Calgary on Saturday.

Riggs, the son of former NFL running back Gerald Riggs, attended Toronto's training camp in 2011 but was sent home to rehab a knee injury and ultimately released. He returned to camp this summer and actually made the Argos' opening-day roster before being relegated to the practice roster and ultimately released.

The six-foot-two, 220-pound Riggs played collegiately at Tennessee, rushing for 1,107 yards and scoring six TDs as a junior. He joined the Miami Dolphins in 2006 as an undrafted free agent and also spent time with the Chicago Bears in 2007.