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Debra was an assistant district attorney who was looking to arrest Riggs, a pimp who mistreated prostitutes such as Erica Steele and ran an underage prostitute ring. When Brandon Walsh wrote a newspaper article with Erica as his source, Mills approached him and ordered him to reveal his source or he would go to prison for being an accessory to a felony. Brandon refused, so she had him arrested.
Erica later set Riggs up on a different charge and got Brandon off the hook and Mills was forced to leave Brandon alone.