2004 Corolla engine noise!

my 2004 Corolla (1.8L) has 135K miles and just died on the freeway. It has proper oil and coolant levels and never overheated. It has only had oil changes and no other repairs. On the freeway going 60mph it lost power and stopped. I was able to start it and creep off the freeway. It starts but has a terrible klunking noise coming from the engine. Sounds like rocks inside. What could be wrong? and how do I determine the possible problem? Thanks
Paul

Sounds like the engine let go. Time for a new or used one.

Take a compression reading and see if any cylinders are bad.