The Hamilton man fatally shot by Beverly police Saturday has been identified as Christopher Whitmarsh, according to Essex District Attorney Jonathan Blodgett.Whitmarsh, 49, was shot and killed by police officers who say he went on a rampage on a residential street, using his SUV as a battering ram to attack police cruisers and an SUV with two women in it.The incident began unfolding on Balch Street behind the Cummings Center business complex at 3:10 p.m.