question about One Tree Hill

I just started watching this show like maybe one or two years ago. When I started watching it Lukas and Nathan's dad was still in prison. I know he was in prison for killing his brother Keith right? But why did he kill him? Did it show in the series when this happened?

yeah it does..forgot when though

Dan's ex was sleeping with Keith and it started this whole brew between the brothers. Dan shot Keith ultimately b/c he thought he set his dealership on fire (which not sure how far you have seen...we find out who really did it--I think season 3)

ok did not see that either. I honestly cant remember how long Ive been watching. At least two seasons but maybe more. I watched little bits and pieces when it first started but didnt get into it because it was conflicting with another show I watched at the time. Cant remember what that was now though. Well at least I know now. I was wondering why that was. I had kinda gotten the idea it had something to do with his ex sleeping with his brother though