New Hampshire's attorney general says the use of deadly force by four Massachusetts state troopers was justified when they shot and killed a man who led them on a 40-mile, hour-long car case into New Hampshire.Michael Brown, of Presque Isle, Maine, died of a gunshot wound to the neck in June in the town of Newton, just across the state line.Authorities say police in Malden, Massachusetts, pursued Brown. They recognized he was wanted in Maine in connection with sexual assault, firearms and stolen motor vehicle charges.Police said Brown fired shots at troopers and drove the wrong way on Interstate 495.Brown crashed into a tree in Newton. Attorney General Gordon MacDonald said in Newton on Wednesday that Brown revved his truck toward the troopers and held a gun.The troopers opened fire. They were not injured.