Can anyone help me reveal the player's location through walls?

Hello Developers,

I am looking to create a system that allows a murderer to track a player's location.

I have made a script to clone a billboardgui to the player's head so that they can be seen.

However, the player can't see the GUI through walls.

Is there any way to fix this, like in games such as Flee the Facility or Notoriety?

Thanks.