Justin Case wrote:

Show me the federal law where it prohibits homicide.

I believe the answer is:

USC Title 18, Part I, Chapter 51, Section 1111.

which can be read at any number of websites including:

http://www4.law.cornell.edu/uscode/18/1111.html
- or -
http://uscode.house.gov/DOWNLOAD/18C51.DOC

Russell Kent