How to assassinate Andre
The secret to this is to first kill hos in Espina (e.g., three), then start the nearby trafficking activity. By the time you leave the cul-de-sac, your gang/star threat level will be up and Morningstar will spawn. Now I believe Andre spawned during this activity for me, but if he doesn't show by the time you're out on the main Espina street, you can exit the activity with the Morningstar cars nearby and quickly kill them to raise your threat level outside of the activity. This, in combination with the hos killed before, should spawn Andre.