Getty Former New York Jets defender Isaiah Oliver reacting ahead of an NFL game against the Miami Dolphins. The New York Jets have lost a key rotational piece on defense in the latter stages of free agency. The Arizona Cardinals announced on social media that they have signed safety Isaiah Oliver . In a corresponding roster move, they parted ways with placekicker Joshua Karty . Arizona Cardinals @AZCardinals · Follow We have signed S Isaiah Oliver and have released K Joshua Karty 4:18 pm · 4