possible oil pump failure

Engine's seizing and oil pumps failing is not a common occurence on the 5.4L V8. A year later, there were some fuel injector issues, possibly sticking open, and causing some issues in severe cases, but for this 2004 F-150 I am surprised. Anything is possible I suppose. Does the engine turn with a wrench on the crank? How is the oil level and condition? A good step would be to drop the oil pan to see what you can see, if the engine indeed does not turn with a wrench.