Why did Littlefinger have Jon Arryn killed?

Why did Littlefinger have Jon Arryn killed? Who really killed Jon Arryn and why? Lysa was obsessed with her child and would not have been able to part with him. Littlefinger used Lysa’s love for him as well as Lysa’s fear of this to get her to kill her husband by poisoning him with the poison Tears of Lys.

Who really killed Jon Arryn and why? Lysa was obsessed with her child and would not have been able to part with him. Littlefinger used Lysa’s love for him as well as Lysa’s fear of this to get her to kill her husband by poisoning him with the poison Tears of Lys.