" Señor Clean ," the 12th episode of The Last Man on Earth's fourth season, aired on March 25, 2018. It centers on the aftermath of Karl the cannibal's death and Tandy’s misguided attempts to build a "mature" relationship with Gail.
The Last Man on Earth Season 4 Episode 12 Recap - TV Fanatic
The episode begins with a typical, comically tedious funeral for Karl. Tandy gives a bizarre eulogy, while Todd leads the group in singing "Amazing Grace" as they bury Karl's remains (which are split into multiple caskets due to his cannibalistic nature).