Was this possum playing possum?

I went for a walk yesterday in a nearby park. There was a possum on the side of the trail. It was motionless but showed no signs of damage. I touched it with my sneaker and it was still soft. I visited the park today and the possum was gone. Is it possible that it had been playing possum? There are no predators in the park. There are some deer, but I don’t think that the deer would frighten it. Might I have frightened it?