“Ashes to Ashes, Dust to Dust, Earth to Alluvium” by Gray Rinehart was published in Orson Scott Card’s Intergalactic Medicine Show. The story is posted here for free to read.
Alluvium is the name of a human settlement and the planet its on, a place close enough to Earth in habitat that colonists can live with just nano-infusions to balance out the few chemicals that are toxic to humans. Life is as good as it can be, until the Peshari (a lizard–like alien race) landed and conquered the human settlements. Cerna is one of the settlers still living under their oppressive rule. His friend, Keller, has become sick, since the Peshari took away their all-important nano-fabbers. Keller has taken an interest in the death rituals of the Peshari and how it differs from human death rituals.