How can I make a tool stay in someone's inventory after they die?

Put a folder in server storage and call it ToolsFolder any tools you want to save duplicate them and put them inside the folder then inside server script service put in a script and type this:

local dss = game:GetService("DataStoreService")
local toolsDS = dss:GetDataStore("ToolsData")

local toolsFolder = game.ServerStorage.ToolsFolder

game.Players.PlayerAdded:Connect(function(plr)
	
	local toolsSaved = toolsDS:GetAsync(plr.UserId .. "-tools") or {}
	
	for i, toolSaved in pairs(toolsSaved) do
			
		if toolsFolder:FindFirstChild(toolSaved) then 
			
			toolsFolder[toolSaved]:Clone().Parent = plr.Backpack
			toolsFolder[toolSaved]:Clone().Parent = plr.StarterGear 
		end
	end
	
	plr.CharacterRemoving:Connect(function(char)
    	
		char.Humanoid:UnequipTools()
    end)
end)


game.Players.PlayerRemoving:Connect(function(plr)
	
	local toolsOwned = {}
	
	for i, toolInBackpack in pairs(plr.Backpack:GetChildren()) do
		
		table.insert(toolsOwned, toolInBackpack.Name)
	end
	
	local success, errormsg = pcall(function()
		
		toolsDS:SetAsync(plr.UserId .. "-tools", toolsOwned)
	end)
	if errormsg then warn(errormsg) end
end)