KANSAS CITY, Mo. (AP) — The family of former Kansas City Chiefs safety Caesar Belser will donate his brain to research into a degenerative brain condition.

Belser’s children said he died over the weekend of lung cancer. He played for the Chiefs from 1968 to 1971, including on the 1969 Super Bowl champions.

His son, Jason Belser, and his daughter, Cecilia Belser-Patton, say the family will donate Belser’s brain to the University of Texas Southwestern and Dr. Bennet Omalu, a key figure in researching chronic traumatic encephalopathy.

The Kansas City Star reports Belser’s children say he suffered from several neurological issues late in life.

Jason Belser, who played in the NFL for 11 years, has already decided to donate his brain when he dies.