Aw, I'm flattered you used my idea for a chapter. Though, I hope writing it didn't give you mixed feelings like Mort seemed to have. It was still hot! My favorite little touch was Celestia keeping the body as a love pillow. I also like how they have official legislation sanctioning necrophilia.
Here's another chapter suggestion that might be more in line with the subplot you had going. How about Fluttershy is found hanging by her neck in her home, wearing a bathrobe that has fallen open to expose her generous bust. It could be a suicide like it appears, or it could be that the possible mystery murderer wanted another fashion model. Who better than the girl that had a (canon, even) stint as a highly successful one?
I think Mort would relish a free pass at such an alluring yet reserved lady. He might even be her first! I was also trying to think of a mourner to come have a last round with her too, like Spike in a previous chapter. With Rarity gone, maybe Rainbow was her next closest friend.
Speaking of Rarity gone, maybe part of the crime scene would be pictures of the two of them together and headline papers about her death strewn about. Actual tokens of despair or careful plants by a killer?
Sorry about the long post. Feel free to use these ideas, change them, or do something entirely different. I'm just enjoying the series and want to help support it.