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Hello. Have you checked the oil? were there any noises before this happened like knocking or anything at all?
Can you pull the dip stick and check the oil level? let me know if it's full and if it looks good.
what happens when you turn the key to crank the engine? any click or anything at all?
Can you remove the serpentine belt and then try cranking it over? also try to put a socket on the crankshaft bolt and use a ratchet to try and turn it over by hand. I want to make sure that something inside the engine didn't come apart and seize the engine up.
You were unable to turn the engine by hand with a socket on the crankshaft pulley?
The belt is in the front of the engine. If you remove the belt, and the engine will turn then you have an accessory that's seized up and not allowing the engine to turn. If the engine still won't turn then either there is an issue with the starter not engaging the the flex plate which would not cause it to die while driving, or the engine seized.
Try watching the crankshaft pulley when attempting to start and see if it moves even a tiny bit or not at all.
Your welcome. Let me know how it goes or if you need further help. I'll do all I can to help.