American actor and martial artist Robert Wall has died at the age of 82, but the cause of his death is still unknown.

Wall was a 9th degree black belt under Chuck Norris and the co-founder and CEO of a martial arts organization known as World Black Belt Inc.

The star’s death was announced by his family on Monday (31st January) as they paid tribute to the late actor.

“Bob was the greatest husband and father. Family was everything to him,” Wall’s family said in a statement.

“He lived a remarkable life and there is a hole in our hearts that will never be filled. His spirit and legacy will live on forever within us. He was our rock.”

In the 1970s, Wall appeared in hit movies such as Way of the Dragon and Enter the Dragon alongside martial arts master Lee.

The actor also appeared in other hit films alongside Norris including Hero and the Terror, Code of Silence and Firewalker.

He won the US professional Karate Championship in 1970. He is survived by his wife Lillian Wall and Children- Shana Wall and Kara Desmond Wall.