Why did Sonny kill Lanning

Why did sonny kill lanning?That's because sollozzo was up front about his association with the tattaglias, who he said would guarantee the investment.Is i robot a prequel?When vito got shot, sonny assumed the ones behind it were sollozzo and the tattaglias.Since spooner is half human (or 3/4 human) he cannot be programmed, therefore he can complete the task.

Spooner and calvin speak with sonny for one last time, and he informs them that he actually did kill lanning , because lanning forced him to kill him, making him swear to listen to him before instructing him to commit it.Susan reveals that she killed another ns5 in sonny's place.Spooner and calvin speak with sonny for one last time, and he informs them that he actually did kill lanning , because lanning forced him to kill him, making him swear to listen to him before instructing him to commit it.Susan and spooner meet up with sonny at usr.