How can i make player die when player presses m?

This is the local script, and I am confused with line 6.

player = game.Players.LocalPlayer
tool = script.Parent
tool.Equipped:connect(function(mouse)
    mouse.KeyDown:connect(function(key)
	if key == "m" then
		
	end
end)
end)

Please help me.

Purpose : Make player die when player presses m while equipping tool. Confused with: Line 6. I don't know what should i do with LocalPlayer

Mouse.KeyDown is deprecated. Please do not use it!

Please use ContextActionService instead!

Here is an example:

local Players = game:GetService("Players")
local ContextActionService = game:GetService("ContextActionService")

local player = Players.LocalPlayer
local tool = script.Parent

function onKeyPress(actionName, userInputState, inputObject) -- The new way we are detecting input
	if actionName == "M" and userInputState == Enum.UserInputState.End then -- Fire when they let go of M
		player.Character:BreakJoints()
	end
end

local function ToolEquip(mouse)
	ContextActionService:BindActionToInputTypes("M", onKeyPress, false, Enum.KeyCode.M)
end

local function ToolUnequip()
	ContextActionService:UnbindAction("M")
end

tool.Equipped:connect(ToolEquip)
tool.Unequipped:connect(ToolUnequip)

Add this line to your script at line 06

Grabs the character from the player and sets the humanoid's state to dead.

Player.Character.Humanoid:ChangeState(Enum.HumanoidStateType.Dead)

Another way to go about it, if you're wondering. Explanation's pretty self-explanatory.

local tool = script.Parent
local player = game:GetService('Players').LocalPlayer

tool.Equipped:connect(function(mouse) -- When the player equips tool
	mouse.KeyDown:connect(function(key) -- When a key is pressed
		if string.byte(key) == 109 then -- checks to see if "m" is pressed
			player.Character:BreakJoints() -- Effectively kills the player
		end
	end)
end)