Kristopher Jordan Ketring knew the two armed, masked men who broke into his home early Tuesday morning and left him shot to death, police Chief Mike Mills said in a Thursday afternoon news conference announcing their arrests. Mills said 20-year-old Bryson Michaelis and a 17-year-old accomplice had come with a plan to rob Ketring. He did not specify what investigators believed the pair hoped to take but said money and drugs were both involved in the confrontation.