Shirley, 24, originally signed on with the Raiders as an undrafted free agent out of UNLV back in May. However, he was among the Raiders’ final roster cuts at the start of the season.
Shirley later signed to the Raiders’ practice squad before joining the the Buccaneers back in October. Tampa Bay later elected to cut him loose in December, but he wound up signing to the Raiders’ practice squad a few days later.
The Seahawks signed him to a future/reserve contract in January, but unfortunately waived him a few weeks after this year’s draft.
In 2015, Shirley appeared in five games and recorded two tackles.