Unifest Fatality?

Strange, unconfirmed claim just made at today's D.C. Council hearing about the Unifest disaster:

Advisory Neighborhood Commissioner Anthony Muhammad claimed to Councilmember Phil Mendelson & Co. that the incident---in which 30-year-old Tonya Bell drove into the crowds at the yearly Anacostia festival, injuring dozens---recently became deadly: Muhammad said that one of the victims lapsed into a coma and later died. He did not give a name of any victim, nor would he reveal his source of the information. The information seemed to be a surprise to the councilmembers, as well.