https://www.cnet.com/news/walking-dead-actor-andrew-lincoln-leaving-season-9-as-rick-grimes/

When fighting the undead, your days are always going to be numbered. Now it seems Andrew Lincoln, who plays Rick Grimes on AMC's The Walking Dead, may be leaving the series. 

"It is being reported that Lincoln will be exiting the AMC series in its ninth season which is currently in production," according to Comicbook, which confirmed the news from multiple independent sources on Tuesday. "AMC is expected to announce officially Lincoln's exit from the zombie drama ahead of his final episodes."