Essex District Attorney John Blodgett's office has identified the police officer involved in the fatal shooting of a Hamilton man who was allegedly on a suicidal rampage when he rammed his SUV into police cruisers and another civilian vehicle Saturday.Beverly Police Patrol Officer April Clarizia, “fired a single shot through the driver's side window” which struck Christopher Whitmarsh, 49, after he was ordered to stop ramming his GMC Envoy into a Toyota Highlander and two police cruisers, according to the DA's office.