Charles L. (Chuck) Miller, 69, a retired supervisor for the Chesapeake & Potomac Telephone Co. and an American Red Cross volunteer for 23 years, died Monday at his Boonsboro, Md., home after a heart attack.

Mr. Mehler was a service foreman and supervisor for C&P for 40 years before his retirement in 1971.

He was a Red Cross instructor and trainer in first aid and water safety and had specialized in working with handicapped people. He was a former water safety chairman and safety services chairman for the Montgomery County Chapter of the Red Cross and had served as a member of the board of directors and as a division consultant for the American Red Cross.

The Red Cross recently honored Mr. Mehler for his more than 33,000 hours of volunteer work. In 1976, he was inducted into the International Livesaving Hall of Fame and received the organization's Golden Whale pin.

Mr. Mehler was born and reared in Washington and had played semiprofessional football here. He moved to Boonsboro about three years ago. s

His wife, the former Alma Nussear, died in 1974.

Survivors include a daughter, Peggy Kline, and four grandchildren, all of Boonsboro.

The family suggests that expressions of sympathy be in the form of contributions to the Montgomery County Chapter of the American Red Cross. c