The bullet that killed a New York state trooper during a shootout Wednesday morning in a farmhouse in the Catskill Mountains came from the gun of a fellow officer, not the suspect they had cornered, the state police said yesterday. The police said that the suspect, who was hiding in the house after shooting another trooper the day before, fired one bullet at the slain trooper, David C. Brinkerhoff, but that it hit his body armor. That bullet knocked Trooper Brinkerhoff onto one knee. He was then struck once in the head, fatally, during the fusillade of bullets that followed...