Remember Night of the Creeps? It was a pretty goofy but fun zombie flick back in the 80’s.
The story was based around parasitic organisms from space that entered the human brain, laid eggs, gestated, then burst out destroying the host. If the host were dead, even long dead, the parasitic little slugs would still be able to reanimate the body into a fierce threat. Most of their victims were the recently dead or the unwilling living which is why I noted above that the “Creeps” would likely be the recently deceased. In some cases these creeps were even mistaken for humans.
For more on how parasites can “zombify” the living check out my early post on Zombie snails.