Evelina Mendoza was an undercover DEA agent. Her DEA handler was Grant Davidson. Mendoza was killed on a bus because she was carrying a secret chip, which was thought to be in her backpack, but was actually implanted in her hand. Evelina Mendoza had been investigating the East Coast faction of a Nicaraguan drug cartel that had recently become aware of The Pattern. Mendoza requested extraction from the operation, which had involved the implantation of a high-tech microchip in the palm of her hand. She was riding a midtown-Boston commuter bus at 8:14 AM when a fellow passenger released an amber contaminant, solidifying the air in the bus and killing everyone inside.