Answer:
Predators of the chipmunk (foxes, snakes, birds, etc) would decrease along with competition (other animals that the predator eats such as rabbits or squirrels) however whatever chipmunks eat (plants or bugs) would increase.
Step-by-step explanation:
If the majority chipmunk population were to die of diseases certain animals in the food chain that ate the chipmunk (possibly foxes, snakes, birds, etc) would decrease in population (if any change at all) along with other animals that these predators ate (rabbits, squirrels, etc). This is because the predators must now find different prey to feed themselves and with the absence of chipmunks, other prey suffers.
But in return, whatever chipmunks eat (plants or insects) would increase in population because there is less of a chance for them to be eaten.
There is also the chance to count that the disease could spread from chipmunks to other animals but to explain this more information would be required of the disease.