A key member of the D.C. taxi industry group charged with conspiring to bribe public officials was planning to kill a confidential informant and destroy evidence, prosecutors said in court documents made public Wednesday.

On Sept. 24, D.C. Councilman Jim Graham’s chief of staff, Ted Loza, was charged with accepting a $1,500 bribe from a member of the taxi industry. The next day, media reports named Abdulaziz Kamus as the informant who wore a wire as he allegedly passed the cash to Loza, part of a scheme in which members of the taxi industry are accused of funneling as much as $350,000 to a D.C. official turned FBI informant.