A veteran Waltham Police Officer and A National Grid worker were killed Wednesday afternoon by a vehicle driven by Peter Simon of New Hampshire. Simon has a long criminal career with similar incidents on his driving record, compounded by mental illness, according to court records. He faced a litany of charges, some minor but charges nonetheless, throughout his life in several states. How did Peter Simon slip through the cracks of the justice system culminating in the deaths of two innocent men two nights ago?