The younger brother of 49ers tight end Vernon Davis and Dolphins cornerback Vontae Davis has been arrested for assault in Washington, D.C. and is a suspect in the murder of a tourist. The Associated Press reports that Michael Davis, 19, was arrested and accused of striking a woman in the head with a hammer. Police are investigating whether he is also responsible for a series of similar attacks, including the killing of a 66-year-old man. Vernon Davis wrote the following on his verified Twitter account on Thursday night: "Just got a disturbing call from back home in washington dc. A good day gone bad! Hopefully he wasnt involved!"