The 32 federal crimes punishable by death. Reading this list, Clintons allegedly at 31/32. They'll need to off someone while serving time.
Causing death by using a chemical weapon or a weapon of mass destruction
Killing a member of the Congress, the Cabinet or United States Supreme Court
Kidnapping a member of the Congress, the Cabinet or Supreme Court resulting in death
Conspiracy to kill a member of the Congress, the Cabinet or Supreme Court resulting in death
Causing death by using an explosive
Causing death by using an illegal firearm
Causing death during a drug-related drive-by shooting
Genocide resulting in death
Carjacking resulting in death
Mailing explosive substances resulting in death
Willful destruction of aircraft or motor vehicles resulting in death.
Causing death by aircraft hijacking or any attempt to commit aircraft hijacking.
Causing death by kidnapping or hostage taking.
First degree murder
Murder perpetrated by poison or lying in wait
Murder that is willful, deliberate, malicious, and premeditated
Murder in the perpetration of, or in the attempt to perpetrate, any arson, torture, escape, kidnapping, treason, espionage, sabotage, aggravated sexual abuse or sexual abuse, child abuse, burglary, or robbery.
Murder perpetrated as part of a pattern or practice of assault or torture against a child or children
Murder committed by a federal prisoner or an escaped federal prisoner sentenced to 15 years to life or a more severe penalty
Assassinating the President or a member of his or her staff
Kidnapping the President or a member of his staff resulting in death
Killing persons aiding federal investigations or State correctional officers
Willful wrecking of a train resulting in death
Sexual abuse resulting in death
Sexual exploitation of children resulting in death
Torture resulting in death
War crimes resulting in death
Large-scale drug trafficking (i.e.: high-level selling of cocaine)
Attempting, authorizing or advising the killing of any officer, juror, or witness in cases involving a Continuing Criminal Enterprise, even if such killing does not occur.
Deprivation of constitutional rights or conspiracy to do so, involving kidnapping or rape, or resulting in serious bodily harm or death.
Espionage
Treason