Mitchell spent his first four seasons with the Raiders, who drafted him in the second round of the 2009 Draft.
He signed a one-year, $1M deal with Carolina before turning in a four-pick, four-sack campaign that was good for a +0.8 grade over 983 snaps according to PFF.
It was his first (barely) positive grade since his rookie season, when he was an insane +9.3 in just 217 snaps.
The Ohio alum started 13 games for Carolina, after having started just nine games over four seasons in Oakland.
Safety is a huge question mark for Denver, what with Rahim Moore attempting to come back from lateral compartment syndrome, Duke Ihenacho having struggled for much of the year, and Mike Adams a free agent.