DONALD J. KEIGHER, 91, a resident of Los Alamos, passed away on Sunday, April 29, 2012. He was preceded in death by his son, Brian Keigher. He retired from the Los Alamos National Laboratory in 1984 as fire protection engineer with the H-Division. Mr. Keigher is survived by his wife of 66 years, Mary Lou Sweeney Keigher of Los Alamos; daughters, Sharon Keigher of Milwaukee, Wisconsin, Shiela Sargent and husband Charles of Boston, Massachusetts; grandchildren, Aaron Keigher of Menlo Park, CA, Kathleen Sargent and husband Dan Read of London, England and Kira Sargent of Philadelphia, Pennsylvania and numerous other relatives and friends. Cremation is being planned. Memorial mass will be celebrated on Saturday, May 5, 2012 at 11:00 a.m. at the Immaculate Heart of Mary Catholic Church in Los Alamos. The family of Donald J. Keigher has entrusted their loved one to DeVargas Funeral Home & Crematory of the Española Valley.