Who married Sir John William Pitt Muir Mackenzie of Delvine, 2nd Bt.?

Sophia Matilda Johnstone married Sir John William Pitt Muir Mackenzie of Delvine, 2nd Bt. on August 28, 1832. Sir John William Pitt Muir Mackenzie of Delvine, 2nd Bt. was 25 years old on the wedding day (25 years, 11 months and 15 days). Sophia Matilda Johnstone was 18 years old on the wedding day (18 years, 1 months and 19 days). The age gap was 7 years, 9 months and 26 days.

The marriage ended in ?.