AMC saw ratings rise for Sunday night's episode of **The Walking Dead**.
The episode was heavily advertised as the final appearance of Rick Grimes on the series.
Sunday night's episode, **What Comes After**, saw 5.4 million viewers tune in.
It was a six percent increase from last week's ratings and the highest since the Season 9 premiere.
**The Walking Dead** airs Sundays at 9 pm ET.