Jamie McDonald

Luigi Mangione's lawyers are asking the judge in his state case to toss it out on double jeopardy grounds, now that he's pleaded guilty in his federal case ... and they say prosecutors are using him as a "pawn" in a sick game. In court docs, obtained by TMZ, Mangione's lawyers are asking a judge…

Luigi Mangione's lawyer says his federal guilty pleas should knock out the state murder case against him ... arguing he can't be prosecuted twice over the same killing. Attorney Karen Friedman Agnifilo spoke outside the courthouse Friday after Mangione pleaded guilty to federal charges in the…