Finding the killer help?

I wanna find the killer of the person who got killed, but idk how to script one. Here what I tried:

function onHumanoidDied(humanoid, player)
namee  = player.Name
wait()
if game.Workspace.namee.Humanoid.Health == 0 then
local killer = getKillerOfHumanoidIfStillInGame(humanoid)
local killerstat killer:GetPlayerFromCharacter()
killerstat.leaderstats.Bounty = killerstat.leaderstats.Bounty + 100
end
end