Chad Kackert's latest comeback attempt appears over.

The Toronto Argonauts announced they have released the running back from their practice roster.

Kackert retired at the end of last year with a severe ankle injury but returned to the team last month.

That's when the 28-year-old reinjured himself, this time a hamstring injury that would reportedly keep him out for 4-6 weeks.

The five-foot-eight 206-pound Kackert was a big-play running back during his three seasons with Toronto, rushing for 1,467 yards and 12 TDs on 228 carries (6.4-yard yard average). He added 50 catches for 454 yards and two touchdowns.

He was the 2012 Grey Cup MVP after rushing for 133 yards on 20 carries in Toronto's 35-22 win over the Calgary Stampeders at Rogers Centre.