Is engine "lock up" the only reason a crankshaft won't turn manually on 04' dodge 2.7?

Question

was passing another vehicle..heard a slapping noise i/e sm belt about 1000 yd before engine chugged once and died. Serpentine is intact. Engine will not turn over . Son tried to turn the crankshaft but could not. I bought new battery.

Answer 1

would be a good bet the motor is gone

Answer 2

Sounds like timing belt broke and valves hit the pistons.

Answer 3

The dodge 2.7L engine is the biggest mistake ever designed. They are known for oil problems and fail before 100K usually.  

Answer 4

that would probably be the engine,the transmission in some cases has caused this too happen ,but very few times,it sounds like it broke a rod and locked up,good luck.