(Seattle, WA) -- The former foster son of disgraced ex-Seattle-Mayor Ed Murray is suing him and the city of Seattle for defamation. The lawsuit filed Friday by Jeff Simpson of Portland claims Murray used his office to defame him and other men who accused him of child sexual abuse last year. Simpson is also accusing City Council members and other public officials of negligence for failing to investigate the allegations. Murray resigned last September after a fifth man accused him of raping and molesting him when he was a teenager. Murray continues to deny the allegations.