The mother of David Koschman files a federal lawsuit over a violation of civil rights. Nanci Koschman cites a cover-up by police and prosecutors in the death of her son David in 2004. Last month, Richard "RJ" Vanecko, the nephew of former Mayor Richard M. Daley, plead guilty to involuntary manslaughter in connection with David's death. Carol Marin has the latest details.

Read the full complaint here and watch the full news conference: