The perpetrator of this afternoon's shooting at the Holocaust Museum has been identified as James von Brunn. Von Brunn reportedly remains in critical condition; his sole victim has died. We spent the afternoon inside von Brunn's very crazy rabbit hole.

Very, very sad news: The United States Holocaust Memorial Museum security guard who was critically wounded in this afternoon's attack, Stephen Tyrone Johns, has died from his injuries, MSNBC is reporting. The reported shooter, though injured, is still alive. [MSNBC]