Hi

For this game fallout 4 I had a quest that lead me to abbots house to find out about the wall and the only way to get in was to lock pick it. So I did. Then he tried to kill me so I killed him and now I'm stuck with the quest mark over his dead body. This been like the for 4-5 days now I even tried to reset my xbox and re sync it

You're not supposed to break into the guys house. I'm assuming you did this during the evening? Break into my house and night and I'm going to try to kill you as well.

Wait until he is at the wall during the day then go talk to him. He'll send you to Hardware Town to get some green paint (you need to make it with the mixer) but you could just as easily give him any blue or yellow paint you have and forgo the bonus payment.