18USC242. Life in prison.
“... or an attempt to kill, shall be fined under this title, or imprisoned for any term of years or for life, or both, or may be sentenced to death.”
Execution of both would send a clear message to the Boyz_N_Blue all across America, and would not inflict the undue burden of jailing these Boyz_N_Blue.
Feeding those things is not cheap!