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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 in the city on Tuesday.

The Associated Press reports that 19-year-old Michael Davis 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. Davis’ father confirmed to ABC 7 in Washington that Michael Davis is the younger brother of Vernon and Vontae.

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 wasn’t involved!”

In 2009 Vernon wrote of his younger brother, “Michael is more talented than both Vontae and I. I just hope he works hard and sticks with it so he can join us in the NFL one day.”

Police say Michael Davis may have been involved in a series of at least four attacks on Tuesday, Wednesday and Thursday, all of which led to serious head injuries for the victims.