Chilling timeline lays bare harrowing final moments of Preston Lord

A new timeline lays bare the horror of the fatal beating of 16-year-old Preston Lord's by a gang of teens in .

Lord was assaulted at a party last October and found on a nearby sidewalk in Queen Creek, a suburb of Phoenix.

Talan Renner, 17, is accused of being the bully who delivered the devastating 'hammer punches' that ended the young athlete's life.

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