| Birth | Mary Katherine Buchanan was born on 3 July 1855 at Galt, Waterloo Co., Canada West. |
| Marriage | She married Charles John Hayes on 29 June 1873 at Winslow, Stephenson County, Illinois.
Information as to Mary Katherine Hayes marriage is provided by a family member. |
| Death | She died on 24 March 1935 at Los Angeles, Los Angeles County, California, at age 79. |
| Burial | She was buried at Inglewood Park Cemetery, Inglewood, Los Angeles, California. |
| Note | Find-a-Grave provides the place of burial for Mary Katherine Buchanan and her husband Charles John Hayes as well as their dates and places of birth and death. |