JOHNSON, Waltraud (Wacker)- Of Westford, November 17th. Devoted wife of the late Richard Johnson. Beloved mother of Bettina Ruelle and her husband Mark of Westford and Donna MacLennan of Malden. Sister of Melita and Bettina Wacker both of Darmstadt, Germany. Cherished grandmother of Matthieu, Collette and Renee Ruelle. Family and friends are kindly invited to attend a Graveside Service on Thursday, November 21st in Westview Cemetery, 520 Bedford Street, Lexington at 11 AM. Expressions of sympathy in her name may be made to the ASPCA-Angell, 350 South Huntinton Ave., Boston, MA 02130.