Kathryn Prey Robertson, formerly of Watertown, SD, died peacefully after a long illness March 3 at her home in Dove Canyon, Calif. She was 75.

Robertson was born April 16, 1941 in Watertown, SD. She and her twin sister, Virginia Prey Berlin, were the only children of Dr. E. Clark Prey and Evelyn Koenig Prey of Watertown. Dr. Prey ran a successful optometry practice in downtown Watertown for approximately 50 years and was active member of the Masonic Lodge.

Robertson graduated from Watertown High School in 1959 and attended the University of South Dakota where she met her husband, Gary Robertson. The couple married in 1963 and shortly thereafter moved to Arizona, and then settled in Orange County, California, where they started their family. Robertson was an elementary school teacher in the Fountain Valley School District for almost 20 years. After retiring from teaching, she began a second career assisting her sons with their medical supply companies.

Robertson is survived by her husband of 53 years, Gary; her twin sister, Virginia Berlin of San Diego; a son, Jeff Robertson (Milena) of Manhattan Beach, Calif.; a son, David Robertson (Claudia) of Hollywood Hills, Calif.; five grandchildren — Yasmin, Kaya, Paulina, Emilio and Santiago; a niece, Lisa Ohmstede of San Diego; and two nephews, Chad Prey of San Diego and Todd Anderson of Parker, Colorado.

A funeral service will be held at O’Connor Mortuary and Chapel (25301 Alicia Parkway, Laguna Hills, Calif., 92653) on March 18 at 1 p.m. to be followed by a Celebration of Life at the Dove Canyon Country Club (22862 Golf Club Drive, Rancho Santa Margarita, CA 92679) beginning at 2:30 p.m.

“In lieu of flowers, donations can be made to the American Lung Association, Donation Processing Circle, PO Box 7000, Albert Lea, MN 56007-8001.”