Looking for John G Milliagan Who Married an L Connell IN Wahington DC IN 1892

My great great Aunt Annie L. Connell, born 1866 in Wahington, DC. married John G. Milligan, born about 1863, at St. Aloysius Gonzaga Church in D.C. John's parents are listed as illiam Milligan and Elizabeth Cramer of Maine. I am looking for John's exact birth date, his occupation, death info and also Annie's death. And did they have children.
Thank you.
Carolyn car.stone@comcast.net