Back when the FBI was first formed it became a Federal Offense to kill a police officer. It was almost an automatic death penalty. Criminals knew if they killed an officer the penalty and that the living cops were going to be on their tail. Trail and the death penalty were swift no 15-30 years for the death penalty to come. It should not matter what state the murder took place the prisoner should be bright to Federal prison without bail and await trial. Found guilty the prisoner would receive the death penalty and have one appeal within 30 days then be put to death by firing squad.