Just when you get to Alpha Labs sector 4, you will find the trapped character In a chamber. Rather than releasing him, press 'Activate Chamber' on the panel, this will kill him and leave a skeleton. Then go to the room on the right, very quickly, before It gets locked, and take the lift down. Then go Into the room with the radiation sign on the front, in the corridor Is the skeleton, you can talk to him, and funnily enough, his name is 'Joe'. He will keep turning toward you, as you move around the room.

But be very fast, as the door to the lift gets sealed quickly.