Memorials may be made To the Family for Frank's Education. Mary Milligan, of O'Fallon, Missouri, died on Wednesday, November 25, 2009 at the age of 52. Loving wife of Keith Milligan; cherished mother of Brennden Milligan and Frank Milligan; dear step-mother of Joshua Milligan and Jason Milligan; dear sister of Rich Enright, Mike Enright and Cathy Barry. Mary was a dear sister-in-law, aunt, cousin and friend. She is preceded in death by her daughter, Shannon.