<human>: Could you distill the essence of the text into 1-3 sentences?

Hello,

We have a 13 year old male cat that has spent most of his life outside and is now pooping outside the litter box. The first 3 years of his life, he was an indoor cat until he began marking things. We believe the trigger was my dad, because we found out later he had a habit of throwing things at the cats when they annoyed him, and Tyson (the cat in question) only marked things that my dad regularly used (favorite chair, work bench, old muscle car in the garage, stuff like that). Other than that he had no problems using the litter box.

Fast forward the last few months, my parents had split up over a year ago and dad moved out(I only feel that this is relevant because he hasn't marked anything). I moved back in with my mom after graduating college. Tyson was still outside, I guess out of habit, but he was getting dangerously skinny and his long fur was horribly matted. I started slowly grooming him and nursing him back to a healthy weight. This also included bringing him inside. There are 2 other cats but they have always gotten along great (they are allowed to go in and out). Tyson has his own litter box while the other two share one (we didn't intend for it to go that way but for some reason he's the only one that uses the second). 

At first Tyson just wouldn't use either and pee on anything soft or in a pile and he would poop in the middle of the garage. I started cleaning out his litter box on a daily basis and he now pees in there but still poops right outside of it. Before we were sure it was him I set up a time laps on my camera with both boxes in view. He pees in the box, steps out and poops right next to it.
<bot>: A 13 year old male cat pees in the litter box but poops right outside even though I clean it daily.