One shot LED circuit

[slurch]

Hi all,
I've been looking for a while now and testing different answers on multisim but none seem to work with what I need.
Basically I need a circuit that has a 12v input and when a switch is on it powers and LED for 3 seconds and then turns off even if the switch stays on, and draws no power once the 3 seconds are up.

Cheers for your help