After starting the first ten games of the 2013 regular season, the Richmond, VA native underwent surgery to have a bone chip removed from his elbow. He showcased his resilience four weeks later, returning to the starting lineup post-surgery and also suiting-up for the East Division Semi-Final against the Hamilton Tiger-Cats. Cash emerged as the club's prominent run-stopper, amassing 22 tackles, one sack and two knockdowns in 2013. He also finished second on the team with a career-high six sacks a season prior and 28 defensive tackles.
The first-year player was activated on Montreal’s 46-man active roster in Week 5 against the Argonauts. Cash finished second on the team in quarterback-hunting with six sacks. He amassed two sacks against Edmonton and Winnipeg respectively and recorded 28 defensive tackles.