U.S. marshals arrested 21-year-old Devante Laws in Hayward on Thursday in connection with the death of Mechthild Schroer.
Mechthild was visiting the U.S. with her husband Stefan in August 2010 to celebrate her birthday and anniversary when she was hit by a stray bullet during a shootout among rival gang members near Union Square.
Two teens were also hit by the gunfire but survived. Police say none of the three victims were the intended targets.
Six other gang suspects have been charged with murder in the case.
Police say the men were fighting when at least one person opened fire.
(Bay City News contributed to this report)