I have always said throughout history the most romantic but sentimental essays written in memory of a deceased wife are 離思 by Yuan Zhen, 江城子 by Su Shi, and 槐園夢憶 by Liang Shiqiu, despite the remarriage of the authors afterwards. 

Now I found a moving article talking about the story of 江城子 written in novel but a little lurid style, and I would like to share it with you at: 

https://www.toutiao.com/a6669324361750544910/