Daryl and Rick found a way to stop a 'war' between a small town and their prison they where staying at. They knew how to do it but they needed help and Merle, Daryls brother, Was rhe only one who really knew The Governor.
Rixk asked Merle to help but he ended up going his own way and he kidnapped Michonne in order to get rick to spare his group. Following a change of heart, Merle let Michonne go back to the group, and continued his own mission to redeem himself.
He fought The Governor but ended up losing. Daryl and Rick found out about Merle kidnapping Michonne and Daryl went after him.
Once Daryl was close to The Governors spot he had to stop and take out some zombies, One of them being his brother..
He came back to the prison and quickly went to his cell and sat on his bed with tears in his eyes as he trys to process his brothers situation. His brother is dead now and Daryl had to do it.