Mary Catherine (Miller) Crook, 81, of Waterloo, passed away July 5, 2018, in St. Louis, Missouri. The visitation is from 4-8 p.m. on Sunday, July 8 and from 8-10 a.m. on Monday, July 9 at Quernheim Funeral Home in Waterloo. The Funeral Mass will be at 10:30 a.m. on Monday, July 9 at SS Peter & Paul Church in Waterloo with Rev. Sebastian Ukoh, C.M. officiating. Burial will be at Jefferson Barracks National Cemetery in St. Louis, Missouri.