From the Ritchie Blackmore Web Site:

We have just learned of the tragic passing of Cozy Powell in a motor car accident early Monday morning, April 6. Our heartfelt sympathy is extended to the family, friends, and fans of Cozy’s.

The news of his death has been a great shock to us all. He will always remain with us: his friendship always valued, and his music immortalized.

Ritchie played with Cozy Powell in Rainbow for 3 studio and 2 live albums.