Minecraft – Run commands as a dead player

I am currently making a gravestone system in minecraft with command blocks, and that means I need to run a command at the location of a player before they die.

I have tried the obvious answer, executing on a player when their deaths score increases: (deaths is a scoreboard tracking deathCount)

execute @e[score_deaths_min=1] ~ ~ ~ summon minecraft:armor_stand

however this summons the armor stand after the player respawns because it can't find the player when they are dead

I also tried teleporting a mob to a player when they die, however the mob can't be teleported to a dead player either:

summon minecraft:armor_stand 0 1000 0 {CustomName:"deadplayer",NoAI:1b,NoGravity:1b,Invisible:0b,Invulnerable:1b}

tp @e[name=deadplayer] @e[score_deaths=1]
function graves:playerdied unless @e[name=deadplayer,x=0,y=1000,z=0,r=5]
kill @e[name=deadplayer]

function graves:playerdied:

execute @e[name=deadplayer] ~ ~ ~ summon minecraft:armor_stand

This does the exact same thing, spawning the armorstand in the player when they click respawn, but not at their death point.

How can I spawn an armorstand or execute commands at the death point of a player, not where they respawn?