im at the part where you have to catch the murderer.. i have tried to come into the town late at night (after 2am), ive tried it multiple times.. when i enter the city the murder is in the house you have to purchase.. you can go in there and beat his face in but he will not die... i have no clue how to actually kill/catch the murderer after multiple/different attempts to do so.. any help please??
p.s. the only pieces of this quesst that have not been completed is getting assistance from the jorleif and catching the murder, both of which i can not complete...

what platform are you on?

You're suppose to wait for him at the market place till late at night, when he attempts to strike again. That's when he is killable. Of course this is assuming you've done everything else that needs to be done to this point.

If you don't know where the market is just enter the city through the main gate turn left and keep walking. If you go there after 2 AM you'll hear a woman scream, run there kill the guy attacking her and you're done

I kiled him in broad daylight while he was sneaking towards someone, then I got arrested, paid my fine then happily strolled back into the palace and infromed Jorlief as to the fate of the butcher.

If you have followed the questline so that Wunferth is not arrested just go to the market and wait, he should appear eventually.

after the wizard told me when the next murder would take place/ market place for me
i just waited for him trhere
killed him as he was walking up to the girl
no issues or problems
colixto was done

Did you just go from scene to suspect? If so, he's probably still set as Essential . You can't kill him until you've talked to the court mage and been told that the murder is imminent.

When I finished up this quest, he was attempting to kill a woman despite 3 or 4 witnesses in the market, and a guard standing literally right next to his victim. As I do a dual impale finishing move on him, the guard is right there in the third person shot, just watching. Nobody had anything to say about my heroic rescue.

I saved the woman as well. She then called me a nasty elf. Shes lucky i have amazing self-restraint.

I have probably messed this up somewhere...I am using the Xbox so no console command either

I have spoken to the Wizard and he has told me to patrol the streets the next night as the killer will strike again however after I leave the palace I see the quest arrow moving to the Hjerim house, The killer then stays in there and never leaves, I have waited at the market place for days now but he never leaves the house. I have tried going into the house but the killer is still marked as essential and if I attack him I get a bounty against me.
I have completed all the other parts of the quest except I have never sold the amulet.

Any one else have this same issue ?

Ive played this quest before and broke it, you may have done the same, try reloading an earlier save, you do have one right

This should have been fixed in the 1.4 patch, that's being released early this week.
Hope it'll fix your problem.

I have earlier saves, so it wont be a great loss to go back slightly . Ive now noticed a few more things that have gone buggy that were ok previously.. The caravan tents arrive outside cities but no inhabitants they are off elsewhere they are still alive at first i thought a dragon had got them but no they are just standing outside another city still selling their wares

On a vaguely related note, I see that version 1.4 has fixed the bug whereby if you didn't buy "clean up the mess" first it wasn't cleaned up. Now, as long as you buy it (and it's bottom of the list) the house is cleaned up.

I think I have a glitch on the part where you are supposed to find evidence of the murder or whatever on the tomb after the body has been moved. Like there are no indicators, not anything. What's up with that?

Click on the tomb, and on the ground around the tomb.

Follow the blood trail. Best to do this in the day... I did it at night and had the hardest time seeing the blood splotches even with a torch or using Candlelight spell.

Haha, she said something mean to me too, although I don't remember exactly what it was. The part that was even more comical was that when I arrived at the scene, Callixto was standing right behind the woman, knife in stabbing-ready position, just poised and waiting to strike. All of this in broad daylight with a bunch of people around. It was pretty funny. I was able to just walk up to him, stand there and watch for a minute, and then kill him. It was like he was waiting for me to be ready.

I just did this quest tonight and was able to save the final victim because I had the Staff of Tandil with me. That worked and evidently it wasn't considered a crime to use it on him. He ran away and I chased him and finished the quest at the house. The woman never said anything.