How to test for any mob death w/o scoreboard

I'm currently working on a simple thing where whenever an entity near me dies, it gives me an item. I can do all of this, save for test when an entity dies. On research, many solutions are there for testing for specific entity deaths using scoreboards, but I just want to use the DeathTime NBT tag to test for any mob death. My command is as follows:

execute if entity @e[nbt={DeathTime:1}]

This doesn't detect any mob deaths. Is it possible to use a solution similar to this, or are scoreboards required? Edit: I am not in the snapshot, I'm in 1.13.2.

Solution 1:

I know this is a deadpost, but as people from Google keep landing here I think it's important to point out...

The reason a player or player-command (datapack) can't use death time, is because the only way to get data from an entity is while it's living. It's not a "broken" tag, in that it works internally as it's supposed to (to control death animations, which you can see work properly), and NO entity can run functions for a player AFTER they are dead, so asking the entity to stores it's data in any of the above examples won't work because your commands just can't TARGET the entity at all, not that the entity "isn't doing the proper thing".

Unfortunately tags are made for the vanilla game to run, not for use to fool around with, we just get to fool around with some.