(C1)(R1)>(Re)(O>)(I)(C2)(C3)(C4)
(C1, C): execute @a ~ ~ ~ scoreboard players operation @s deathDisplay = @s deathCount
(R1, Delay: 4): testfor @a
(I): scoreboard objectives remove deathDisplay
(C2): scoreboard objectives add deathDisplay dummy "§cPlayer Deaths"
(C3, C): scoreboard objectives setdisplay sidebar deathDisplay
(C4): scoreboard players add @a deathCount 0