Roundworm in the Brain = Death.

From the website:

In 1980, he saw the first confirmed human death, a Pennsylvania boy who apparently had eaten feces from raccoons living in the family's chimney. Like the birds, the boy had neurological problems and trouble controlling his muscles. The autopsy showed roundworm larvae in his brain.

Link - via MoPo

Previously on Neatorama: Six Horrifying Parasite