Mary Jean O'Brien, the daughter of George and Zora Gaunder, born on June 27th, 1928 in Michigan, passed away on June 22nd, 2014 in Antelope, California at the age of 85 years. Mary was a devoted homemaker, cherished wife and mother, grandmother. She is survived by her children, Michael O'Brien, Barry O'Brien, Rory O'Brien, Kelly O'Brien, Rebecca 'Brien, Monica Walsh, Brien O'Brien, Mary Humphries and Brigit Erman. She was preceded in death by her husband, Brian John O'Brien. Graveside Services will be held on Wednesday June 25th, 2014 at 10:00 a.m. at Calvary Catholic Cemetery 7101 Verner Ave, Sacramento, CA.