From reports, its said that there had been some arguments between them 2 and Roger was wanting a change. So u can pretty much say it was due to business disputes
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she got HIV left a note for roger cut her wrist and bled to death
In "The Lord of Flies", Roger begins to take on Jack's traits and reacts in the ways of his leader. Although he had always had a cordial relationship with Ralph, Jack's hatred of him eventually causes Roger to hate him as well and go along with the plot to kill him.
Jack has the effect of allowing Roger the freedom to indulge in his fantasies. Ralph's rules and fairness where a refection of the civilised society that the boys came from and acted as a restraining influence on Roger. Jack's lack of rules and fondness for killing and violence allowed Roger to hurt and even kill people and pigs with no fear of disapproval. Roger felt free to do what ever he wanted.
Jack, Roger, and the Littluns kill Simon when he shows up to warn them.
ralph grabbed Eric's spear and jabbed at roger during a "kill the pig ritual"