The suspect in the attack, Dylann Roof, was seen in photos waving the Confederate battle flag, reigniting debate across the country and in South Carolina over displaying it.
Lawmakers are set to reconvene Tuesday for a third procedural vote on legislation moving the flag. The legislation also needs a two-thirds majority in the state House, where the schedule is less clear.
A survey out last week showed enough support in both chambers to remove the flag.
— This story was updated at 4:58 p.m.