Time. In july, 1998, a delusional seriously mentally ill man walked through the Metal Detectors at the Capitol Building while he was carrying a loaded smith and wesson resolver. A u. S. Capitol Police Officer stopped the man when he set off the alarm and asked the man to go through again. The man turned without a word and shot officer chestnut in the head and killed him. The man then shot and wounded another Police Officer, officer douglas mcmillan, who then returned fire and hit the attacker. The attacker then shot and mortally wounded a u. S. Capitol police detective, detective john gibson, as he was telling members of congress and their staff to take cover. Detective gibson was killed by the atactor that day, in 1998, but before he died, he nevertheless was able to return fire as well, and that is apparently what took that gunman down sxended that oneman attack on the u. S. Capitol in the summer of 1998. The attacker, although he was shot by officers who returned fire, he survived.