Sarah M. LaRocque, 55, a real estate agent for Begg Inc. here for the past 20 years, died of cancer Friday at her home in Washington.

Mrs. LaRocque was born in Tacoma, Wash. She earned a pilot's license at the age of 19, and was one of the first group of women flight attendants hired by Pan Am to fly the Seattle to Alaska route in 1944.

In 1945, she married then Navy Lt. Gene LaRocque. A retired rear admiral, he is now director of the Center for Defense Information.

Mrs. LaRocque traveled extensively with her husband, and wrote a social column for the Newport Daily News in 1955.

She moved here in 1957. She was president of the Naval Officers Wives' Club of Washington in 1968, and laid the cornerstone of Vinson Hall, originally established as a home for Navy widows, in McLean.

Mrs. LaRocque was a member of the Woman's National Democratic Club.

In addition to her husband, of the home, she is survived by a daughter, Annette, and a son John C. both of Ashburn Va. another son Navy Lt. James C. stationed at the U.S. Embassy in London; her mother, Madeline Fox, and a sister, Jean Groom, both of Arlington; another sister, Lila Keller, of Los Angeles, and one grandchild.