What is the federal rule regarding a person that willfully witholds information related to a murder?

This answer does not create an attorney/client relationship.  I am a S.C. lawyer and board certified internal medicine physician. If one willfully withholds information related to a murder, this person is guilty of obstruction of justice and faces potentially serious prison time.  There are sentencing guidelines, but ultimately it is up to the judge as to how much time a person serves. Regards, I am Michael G. Sribnick, M.D., J.D. Attorney at Law Owner of Michael G. Sribnick, M.D., J.D., LLC www.michaelsribnicklaw.com