The pilot of a civilian helicopter, who was the sole occupant, was killed after the chopper crashed into a reservoir in a northern city Tuesday, rescue officials said. The aircraft, carrying the 67-year-old pilot, crashed into the reservoir in Pocheon, 52 kilometers northeast of Seoul, at 11:08 a.m., according to the officials. Rescue authorities found the pilot dead inside the submerged aircraft at about 3 p.m. after mobilizing divers and rescue boats for the search operation in the reservoir,