frozen engine on 2000 Lincoln Navigator

my suv was parked for 3 months and i told my son to pick it up he drove it for a mile or so got it up to highway speed and it started knocking he pulled over it died and now will not turn over i have charged the battery have no idea what it is no smoke no nothing prior to freezing up

Asked by for the 2000 Lincoln Navigator
Have you checked the coolant level and engine oil level? Are these levels OK? Did the Check Engine Light come on or temperature gauge read higher than normal or did you receive any warning message on the information display?
It is possible that your engine just experienced random catastrophic failure but this hardly ever happens with out giving some warning. Could someone have been driving your Navigator when you had thought it was parked? Sorry to hear the engine has given out. Very expensive repair to remove and refit a new engine.
all levels were fine and no check engine light on or anything