How do u shut Dr Pickman up without killing him and failing the level?

it sounds like you are in origins. You need to shoot the 3 speakers. the first is located after you have killed the bad guy just after you wake up and shot the doc in the head. go through to the next door and climb on top of the PC. the speaker is right in front of you. Next, smash the window to your left and open the door using the red button. go accross the hallway, open the other door and run into the morgue. straight away you need to kill the goon to your right. Once he is dead, climb onto the gurney to your left and shoot the speaker.
climb down the gurney, turn left but watch out there is another goon waiting for you. Kill him, get the ammo they drop, and run towards the double doors. Turn immediate left, kill the goon in front of you, then shoot the speaker on top of the scaffold to your left. then go downstairs. good luck