I haven't come across his yet, but here is the obituary for his wife:
Markham – Sunday, Dec 5, 1948, Elizabeth Markham, age 72 years. She is survived by her husband, Charles J. Markham; four daughters, Mrs. Ruth Pierce, Mrs. Delma Dunning, Mrs. Myrtle Smith and Mrs. Nellie Green; two sons, Harold J. Markham, Rochester, N.Y. and Herbert N. Markham, Hamilton, Ont., Canada; two brothers, Charles Lucas, Rochester, NY and Thomas Lucas, Woodbury Heights, N.J.; 14 grandchildren and one great-grandchild.
Source: Rochester Democrat and Chronicle, December 6, 1948
Also, if you look on Find-a-Grave, you will see pictures of their stone.