With his daughter near death in a London hospital, Harewood was approached by "John Harrison" with the promise that he could save the girl's life (for a price). Harrison then transfused a small amount of his genetically enhanced blood into Lucille, which healed her.
In exchange, Harrison, who was in reality Khan Noonien Singh, coerced Harewood to ignite a bomb in the sub-basement of the Kelvin Memorial Archive, which leveled the building, killing forty-two people, including Harewood himself, in the process. This act instigated a top-level meeting of Starfleet personnel at Starfleet Headquarters, which then allowed Khan the opportunity to attempt to assassinate Admiral Alexander Marcus in revenge for the presumed death of his crew. (Star Trek Into Darkness)