Dr. Joseph John McDonald, 65, a pediatrician who practiced in Prince George's County for more than 30 years, died Dec. 1 at the University of Maryland Hospital in Baltimore of internal injuries suffered in a fall at his home in Annapolis on Nov. 29.

Dr. McDonald was repairing an outside television antenna when he fell from a ladder. A spokesman for the Maryland medical examiner's office said the death was ruled accidental.

Dr. McDonald was a former associate professor of pediatrics at Georgetown University Medical School and chief of pediatrics at Providence Hospital.

A native of Washington, he was a graduate of Gonzaga College High School, Georgetown University and Georgetown University Medical School. He served in the Army Air Forces as a physician during World War II.

After the war, Dr. McDonald entered private practice of pediatrics, and he practiced in Prince George's County until he went into semi-retirement in 1980. During his career he had offices in Hyattsville, College Park and Langley Park.

Since 1980, Dr. McDonald continued to practice on a limited basis and worked at pediatric clinics.

He was a member of the Montgomery/Prince George's Pediatric Society, the Southern Medical Society and the Anne Arundel County Association of Retarded Citizens. He was "Pediatrician of the Year" in Prince George's County in 1979, and in 1964 was co-chairman of the county's Stop Polio Campaign.

Dr. McDonald was a communicant at the St. Andrew by the Bay Catholic Church in Annapolis.

Survivors include his wife, Ann St. Jacques McDonald of Annapolis; four daughters, Joanne Gerber of Kensington, Maureen Allison of Burtonsville, and Kathleen Wasowski and Marianne McDonald, both of Annapolis; a son, Joseph John Jr., of Maysville, N.C.; his mother, Elizabeth Dillon McDonald of Bethesda; a brother, Paul, of Silver Spring, and nine grandchildren.