Help im so confused!

Sorry couldn't find any video but I'll explain it as best I can- So Nathan walks onto the stage and sees Mag lying dead. As he walks past The Largos, Luigi slashes him in the back with a blade he has hidden up his sleeve. Nathan lays in a pool of his own blood, crawling across then floor and there's an angry exchange between him and Rotti Largo. Every time Nathan tries to get up he is diberikan an electric shock oleh Rotti's 'henchwomen' which throws him back onto the stage floor. Then Rotti reveals to Shilo that Nathan has made her ill oleh poisoning her medicine, to try to get her to hate her father. Then Shilo has one of her 'attacks' and passes out. Nathan pleads for someone to help Shilo, but the audience just sit there watching. selanjutnya thing Shilo wakes up and Nathan's sat in a wheelchair nearby. Nathan expresses to Shilo how sorry he is for letting her down,and making her ill so that he could keep her prisoner. Then Rotti hands her a gun and tells her that if she kills Nathan, he will leave Geneco to her (which shocks the Largo kids)
Shilo is absolutely horrified oleh this and tells Rotti she is not a murderer. She still loves her father despite everything, and refuses to kill him. So Rotti takes the gun and shoots Nathan himself. Then Rotti gets angry at his kids for not living up to his expectations, before collapsing and dying on stage. This is followed oleh an emotional scene between Nathan and shilo where they sing to each other as he lays dying. Then Nathan takes his last breath, and Shilo goes out into the world on her own...
Hope this helps, and sorry if it's confusing!!
- anda really should see the movie properly if anda get chance, it is amazing!! =)

to make pinkpumkin's answer short: rotti shot him. he died from the wound