A tigress, which had killed a boy last year, was tranquillised and captured after it came close to a human habitation near the Dudhwa Forest Buffer Zone here, officials said on Thursday. Following the killing of the 10-year-old boy on November 10 last year at Nimbuabojh in the buffer zone, the tigress was captured and radio collared. It was released into the wild on November 29 that year.