28 U.S.C. § 540 : US Code - Section 540: Investigation of felonious killings of State or local law enforcement officers

Search 28 U.S.C. § 540 : US Code - Section 540: Investigation of felonious killings of State or local law enforcement officers

The Attorney General and the Federal Bureau of Investigation may
investigate felonious killings of officials and employees of a
State or political subdivision thereof while engaged in or on
account of the performance of official duties relating to the
prevention, detection, investigation, or prosecution of an offense
against the criminal laws of a State or political subdivision, when
such investigation is requested by the head of the agency employing
the official or employee killed, and under such guidelines as the
Attorney General or his designee may establish.