Martha Whiting died March 31, 1883 age 42 according to Death records of the Village of Vicksburg.
Kalamazoo County Death records list Velorus Whiting died 1920 in Vicksburg (I only have access to the index)
Charlott Whiting of Vicksburg age 21 born Brady Twp, Kalamazoo married George Riley Slater of Vicksburg age 38 born Chenango Co., NY on July 7, 1883 George was a Drayman.They were married by Isaac Wattles JP, Witnesses Valentine Bruen? and Nelly Burdick.
I did find them in the census in 1860, 1870, 1880.I haven't found him 1900 but I'll keep looking.