Waltham - Mrs. Muriel (Hayhurst) Tronstad of Waltham died Sunday, January 22, 2006 at MeadowGreen Nursing Center in Waltham. She was 93. Born in New Bedford, a daughter of the late Richard and Alice (Dewhurst) Hayhurst, she lived in Waltham for more than forty years. She worked for many years as an inspector for the Raytheon Corporation and also worked for thirty years as an assembler for Adams-Russell in Waltham. She was the wife of the late Rolf B. Tronstad. She is survived by her close friends, Ernest and Marion Hoagland of Inman, South Carolina, and Maureen and William Leary of Dracut. Funeral services and burial will be private.