Law Enforcement Protection Act of 2005 - Amends the federal criminal code to provide additional penalties for assaulting or killing (or attempting or conspiring to kill) a federal law enforcement officer or a federally funded state or local law enforcement officer. Modifies provisions regarding influencing, impeding, or retaliating against a federal official by threatening or injuring a family member to provide additional penalties where the victim of the offense is an immediate family member of a federal law enforcement officer or federally funded law enforcement officer.