I have a spreadsheet where I have all the Child ballads and who kills whom and why.

Child ballads where someone dies for love:
   #64 Fair Janet
   #74 Lady Margaret & King William
   #75 Lord Lovel
   #84 Barbara Allen
   #85 George Collins
#229 Earl Crawford
#235 Earl of Aboyne
#239 Annachie Gordon
#256 Allison & Willie
#262 Lord Livingston
#295 Rich Irish Lady
Also #238 Jeanne of Bethelnie was saved from dying for love when the man relented and decided to marry her.


Funny, most of these are not popular today. I don't even remember the story on several of these without looking them up.

By my calculations, a bit over half of the Child ballads involve death in some form. (Part of why this is so "low" is that the Robin Hood ballads rarely involve death and there are 40 or more of them in the 305.)