How do I kill cletus?

Ok this took me awile to all you have to do is kill the convicts steal there gun, then go to the gun shop and watch the cut scene, as soon as it ends run outside and clear the area, once that is done hide behind one of the doors so that you shot cletus with the convicts gun, you can shot him but he can't shoot you because the glass door is bullet proof

If you are talking about the Gunstore nutjob then this is easier than you think, if you want to make it out of here alive make sure you are at least a level 15 or at least somewere around thier, it's really easy weapon choice here just make sure you get a shotgun, at least three handguns, a melee weapon, and at least some kind of food that gives you 5 bars of health. After the screen is loaded go outside of the store and kill all the zombies with the melee weapon don't stand in the doorway too long or he will shoot you, once all the zombies are killed in the square area get next to the door entrance to the Gunstore(not behind it just far enough so he can't see you but you can see him), once he gets in your cross hairs take aim and try not to miss(/ waiste ammo), and you should of gotten him(takes about all three handguns and half the shotgun).

Easy way to find the guns:
Handguns- are most likely to be found on zombie cops, and if you find youre self ten ft away from the gun store and you forgot your handguns and before you start to cuss yourself out just walk about 30 ft down the hallway from the gun store and go into the store that looks like it has a back door because in that hall way their are three zombie cops with Handguns, after you kill Cletus their will be Lots of handguns there.
Shotguns their is only one place to find a shotgun before unlocking the Gunstore, right from the start of the game when your at the Entrance Plaza a guy named Brian will have a shotgun he will later die when the zombies come and attack so go were he dies and take it.
Sub Machineguns-
-Paradice Plaza- their is a store called "Kids' Choice Clothing" and thier is a floor type thing sticking out of the wall, walk up the stairs then jump on the rail, then jump to the wall thing if you walk further down youll see the gun.
-Leisure Park- next to the parking lot their is a walkthrough to the Lot from the park at the start of walkthrough thier is a tree to your right walk over and pick up the rock look up and do you see the Sub Machinegun, through a little higher than the gun and you should of hit it.
-Alfresca Plaza- their is a Fountain next to the entrance of the "Entrance Plaza" in the Fountain should be a Dumbell, and the Sub Machinegun.
-Food Court- if you see the sign with the chef on it all'so known as "Chris' Fine Foods", all you have to do is to get on a Dinning Table then jump to the rail then climb on the sign and their will be one on the front.
-Wonderland Plaza- I've heard from some friends there is one on top of the lego building I'm not sure though.

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Frist, you should get the small chainsaws you get from Adam, the clown, and also. You should get three books: The Criminals book in Sir Book-a-lot close to The space rider, The entertainment Book and the Construction book in Paridise Plaza, abd when you have these books, it should make your small chainsaw 9x stronger. Then head to the store and right away, hide behind the rack and wait till he reloads and shoot him with a gun, but if you don't have one then throw anything that will hurt him, then he should get closer to you, then when he reloads, go really close to him but DON'T jump over to him, just get really close to him where you can smack him with the smallchainsaw, and when he grabs you, he will throw you and you will lose one or alittle block of heatlh, then get back right up and hit him with the smallchainsaw and keep on hitting him and then he will pick you up and throw you again, then get back up and hit him again and he should die REALLY SOON before you even die, or you can try to jump over and hit him, that a good way to kill him, I hope this helps and if it don't, then I will try to figure out another way to kill him, but this way REALLY HELP ME and I beat him really fast, this SHOULD WORK......Have a good time time killing him.

The easiest way is to get the Real Mega Buster by getting the Zombie Genocider achievement. Its totally worth it to dedicate one 72-hour mode to getting it because this gun can kill him in about 3 shots. All you have to do is load up on food and wait for him to reload, then you just jump out and shoot him a couple times and then you have access to all the firepower you could ever need.