As big of a character as he was, Roy Petty’s death in Ozark is rather inconsequential towards the show’s future.
The only question now is if the F.B.I. has another agent tough enough to hang with the various criminals of Ozark.
In fact, Petty’s death is almost beneficial to the F.B.I., as the agent was getting increasingly sloppy with his methods of obtaining information.
His death will undoubtedly help cover up anything he did that would’ve constituted a mistrial should the F.B.I. move in on the Byrdes or Cartel, and all that information he gathered is in the agency’s hands and ready to hand off to the next agent on the case.