function not showing up when i put code in it

my function works when there isnt code in it, but something in the code just makes it so it doesnt even show up in /function.
murder.mcfunction:
execute as @a at @s if score @s Kills Matches 1.. run tag @s add Killed
execute as @a at @s if score @s Deaths matches 1.. run function killer:died
any clue why?