NURSE AT FOX CHASE, 48 Karen Hoster Havelin, 48, who spent her 28-year nursing career caring and comforting cancer patients, died Saturday of internal injuries received in an auto accident in Upper Southampton Township. She lived in Churchville. Mrs. Havelin worked during the week at the Fox Chase Cancer Center and on weekends for a home-care nursing agency to earn extra money for her sons' college tuition, her family said. She was en route to a patient's home when her auto was struck at 8:30 a.m. by a pickup truck at Stump and Street Roads. Mrs. Havelin worked 25 years at Fox Chase after a three-year stint at Jeanes Hospital. Born in Logan, Mrs. Havelin graduated with a nursing degree in 1970 from Methodist Hospital and earned a bachelor of science degree in nursing from La Salle University in 1987. Surviving are two sons, Michael and Paul, and her father, Henry Hoster. A viewing will be at 5:30 p.m. Friday at St. Matthew's Episcopal Church, 919 Tennis Ave., Maple Glen, followed by funeral services at 8 p.m. Burial will be private.