Chainsaw

One place where I found it was in the Jungle section.

You will come across a bridge where a jeep has crashed and is partly hanging off the side I think. There is a woman trapped under it. Clear the bridge of ALL zombies. Then once that is done she will come out from under the jeep and ask you to collect all the first aid boxes lying near by.

Once you do that there is a hut down in the ravine. It's surrounded by trees and zombies are gathered in a group outside it. There is a guy attacking them. Once he has dealt with them he focuses on YOU. And he can be pretty tough to deal with depending on what you have with you.

To make it easy to deal with him. I just use an assault rifle with electricity rounds (shock rounds). And I soften him up by throwing a couple of grenades first (or the DEO explosives). Once you kill him go up to his hut and inside it and the chainsaw is there at the back of the hut. I think it's next to a severed head surrounded by candles.

So that's where the chainsaw is. You don't need to collect the first aid boxes first to get there. Just find that bridge and then get to the side of it where you can go down a STEEP slope at one end. And go to the right into the trees and that nutter and his hut is there - with the chainsaw inside.

"I want to kill everyone. Satan is good. Satan is our pal."