Federal Public Safety Officers Supplemental Death Benefits Act of 1984

Federal Public Safety Officers' Supplemental Death Benefits Act of 1984 - Directs the Secretary of Labor to pay a benefit of $50,000 to the survivors of any Federal law enforcement officer or firefighter who has died as the direct result of an injury sustained in the line of duty.

Authorizes the Secretary to make an interim payment not to exceed $3,000 to a survivor who, in the Secretary's determination, probably will receive such a benefit.

Declares that no such benefit shall be subject to execution or attachment.

Prohibits payment of such benefit: (1) if death was caused by the intentional misconduct, suicide, or intoxication of the officer or firefighter; and (2) to any beneficiary whose actions contributed to the death of the officer or firefighter.