Carol

 was a humanoid woman. At some point after her death, she was animated as a zombie under the necromantic control of Gern Blanston, serving with fellow thralls Coral, Fatty Arbuckle, and Stimpy. As an NPC, was played by Matthew Mercer.

Background
Carol was not related to Gern Blanston or his other thralls, although Gern did get Carol and Coral confused and considered them all a make-shift family.

Encounter with Vox Machina
While investigating the ruins of Pyrah after Thordak's escape from the Elemental Plane of Fire, Vox Machina spotted a group of four undead creatures. After a low Stealth roll, Scanlan alerted Carol to their whereabouts, and she started hobbling towards them. Not knowing Gern Blanston yet, Vex'ahlia shot an arrow at Carol, then Vax'ildan threw a dagger at her, severing her head.

Trivia

 * "Carol" is an anagram of "Coral", one of Gern's other undead thralls.