Police say there were two similar assaults in the area where the killing took place. Michael Davis is accused of one of those attacks. Investigators say none of the victims knew each other. They all suffered head wounds and were attacked suddenly and with no provocation.
The victim was a 66-year-old man from Denver.
Friday morning, Vernon Davis tweeted, "Just got a disturbing call from back home in Washington, D.C. a good day gone bad. Hopefully he wasn't involved."