(Phoenix, AZ) – Police in Arizona believe a string of shootings in Phoenix and Scottsdale are connected. It began Thursday when noted psychologist Steven Pitt was shot to death outside his office. Pitt worked on a number of high profile cases, including the murder of JonBenet Ramsey and the Columbine massacre and in Arizona, the Baseline serial killer. On Friday two women who worked as paralegals at a law office were shot and killed. Scottsdale Police say they believe the murders are connected.Police are currently investigating a fourth deadly shooting that happened yesterday. They say the victim was a man, but did not provide any further information. AZcentral.com says the victim was Marshall Levine, a psychologist and counselor. Police are still investigating if his murder is connected to the others. No suspects have been arrested in any of the cases.