AlphaMode

I've played around with LivingDeathEvent and can't seem do get anything right I have tried both 1.8.9 and 1.14.4 versions I am trying to make a mob counter to keep track of how many kills a player has that has a custom like "jeb"

I'm using 1.8

I've tried a few things with the OnLivingEntitiyDeath event but every time I get the player it also gets the kills from other players online I also want to check the mobs name (not the default name the custom name) I cant reply with my code rn bc I am on my phone