What killed the T. rex?

What killed the T. rex? This extinction was probably caused by a catastrophic asteroid colliding with Earth. It is thought that a an asteroid 4-9 miles (6-15 km) in diameter hit the Earth off the coast of Mexico.

This extinction was probably caused by a catastrophic asteroid colliding with Earth. It is thought that a an asteroid 4-9 miles (6-15 km) in diameter hit the Earth off the coast of Mexico.