Mission can be downloaded also on DYOM site:
http://dyom.gtagames.nl/show/55216

The story:
Your target: James Murkoff - biggest criminal in San Fierro. Vladimir, your boss want you to silence him - because he destroyed his life. You go to San Fierro to end his life - but you need to remember - as lot of people say he has "5 star security" so you need to be careful.

Support the mission on DYOM site also giving it some good rating & downloads.