Two suspects, including a police officer, have been arrested in connection with the fatal shooting of psychologist Dr. Victoria Mutiso. Detectives say they have made a major breakthrough and are pursuing additional suspects. Police recovered a pistol believed to have been used in the killing, a motorcycle suspected to have ferried the gunman, and a Toyota Prado believed to have blocked the taxi carrying Dr. Mutiso before she was shot dead in Nairobi’s Upper Hill area.