Dead Man Walking is the 7th mission of Crysis 2. For this walkthrough, players will jump across buildings and navigate city streets to get through fortified CELL positions, to reach the nano-suit lab. This mission can be quite fun due to the many different approaches you can take to reaching the objective rooftop, which include both ground and rooftop routes.

1. Walk out onto the landing to see the situation below. As you will notice, this mission is actually the same one shown in one of the trailer cutscenes.
2. Wait for the helicopters to fly past.
3. Activate Armor mode, in order to be able to survive the drop down onto the landing below.
4. While still in Armor mode, jump to the rooftop to the left of you.
5. Jump up one more time to get onto the rooftop. 
6. Take out the soldier with a stealth kill.
7. Take out the 2 other soldiers at the front of the roof. You can choose to take the sniper gun here, and then use it to snipe the men below from a safe position.
8. Once again jump to the building to the left with Armor mode on. If you manage to get all the way to the rooftop, take the passageway over the streets to the next roof. If you miss and fall down on a lower level, you will have to take a longer route.
9. If you missed the rooftop, drop down onto the street and make your way across the road to the building in front.
10. A Stealthy approach is once again favored here due to the large number of enemy forces.
11. You will have to go up the partially-broken metal construction up the side of the building to get to the objective. If you stay on the ground level you will just be met by closed doors.
12. As soon as you reach the rooftop, you will be assaulted by heavy fire. Stealth as soon as you can and take cover in the passage way to the left.
13. Decide your method of approach to get across the roof. As the rooftop will be crawling with soldiers in a confined place, you will probably have to either brute force it to get through, or combine stealth with some small firefights. Either way, start out by taking out the nearby soldiers from the safety of your position.
14. A helicopter will likely appear nearby. If it's bothering you, now would be a good time to use your rocket launcher to easily take it out.
15. Head over to the objective doors.
16. If you already have some C4 you picked up earlier in the game, use that to blow up the doors. If you don't have it, just pick some up from the ammo caches around the rooftop.
17. To use the C4, simply press the left mouse button on where you want to place it (the doors) then walk a safe distance away and blow it up using the right mouse button.
18. Go down into the building.
19. Get through the soldiers, and use the terminal to get the mission update. 
20. Step into the elevator.
21. Follow Gould.
22. Step into the chair.
23. After the long cutscene, press Spacebar a few times as advised by the tip.
24. As soon as you're up, you will be attacked by aliens.
25. Take immediate cover and wait for a mission update.
26. You don't have to kill anything, just wait for instructions to press F to watch, and the mission will be complete.