Born November 18, 1924 in Butler, Pennsylvania she was the daughter of the late James E. Dietrich and Dora A. Brown Dietrich.

Mrs. Olen was a 1941 graduate of Butler High School. She then attended Butler Hospital School of Nursing, graduating in 1947 as a registered nurse. She worked at the Butler Memorial Hospital, retiring in 1986. Mrs. Olen was a member of Oak Hills Christian Church - Disciples of Christ of Butler. Bonnie also enjoyed reading and scrapbooking.

Mrs. Olen is survived by one son, Michael J. Olen, and one daughter, Melanie J. Olen, both of Butler; one grandson, Michael R. Olen of Butler, one granddaughter, Lisa M. Olen of Mars; two sisters, Mrs. Delores Halahurich and Miss Donna Dietrich, both of Butler; and several nieces and nephews.

Mrs. Olen was preceded in death by one granddaughter and one sister.

Friends will be received at the Thompson-Miller Funeral Home, Inc., 124 East North Street, Butler, Pennsylvania on Friday, March 26, 2010 from 2:00 to 4:00 and 7:00 to 9:00 p.m.