What killed him? What was in his heart, lust brought forth sin and sin brought forth death. Christ pointed to we sin first in our hearts before the act. He said that if a man looks upon a woman to lust he had already committed adultery with her in his heart.
James 1:.....
13Let no man say when he is tempted, I am tempted of God: for God cannot be tempted with evil, neither tempteth he any man:
14But every man is tempted, when he is drawn away of his own lust, and enticed.
15Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death.
Why where they able to be tempted? If they can only be tempted when led away by their own lust. What was the root cause in their heart. Reverse engineer it, work it backwards.
Christ said if you love me you will keep my commandments. God asked Adam have you done what I commanded you not to do.
I John 2:...........
15Love not the world, neither the things
that are in the world. If any man love the world, the love of the Father is not in him.
16For all that
is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world.
17And the world passeth away, and the lust thereof: but he that doeth the will of God abideth for ever.
Work it in reverse and will find what was the cause.