With his daughter near death in a London hospital, Harewood was approached by John Harrison with the promise that he could save his daughter. Harrison transfused a small amount of his genetically enhanced blood into the younger Harewood, which improved her condition.
In exchange, Harrison coerced Harewood to ignite a bomb in the sub-basement of the Kelvin Memorial Archive, which leveled the building, killing forty-two people including himself in the process. This act instigated a top-level meeting of Starfleet personnel at Starfleet Headquarters, allowing Harrison the opportunity to wipe out the Starfleet brass with a single attack. (Star Trek Into Darkness)