A United States Capitol Police Officer, William “Billy” F. Evans, died this week after he and another officer seemingly were deliberately hit by a car as it was driven into a barricade at the Capitol Building by a man who then threatened other officers with a knife before being shot and killed. Evans had served with the Capitol Police since 2003. News reports have emerged suggesting that the perpetrator, 25-year-old Noah Green who was living in Virginia, had been experiencing increasingly delusional thoughts and declining mental health, perhaps attributable in part to drug abuse. The Associated Press says that investigators believe the attack was an isolated incident. Keep reading for more news.