Found: Horror: Alien who collects brains

I'm looking for a horror book about an alien – I think it is written from the perspective of the alien.
By the end of the book, the reader (kind of) sympathizes with the alien, even though the alien is evil.
In this book, the alien collects brains, I think it is to power his spaceship – although I'm not entirely sure.

R. Lee Smith has one called Heat the alien manufactures a drug out of some part of the brain, he comes to earth, kidnaps a girl, kills a lot of people, and the story follows him, as well as the space cop or whatever who is following him trying to take him in. its pretty graphic and violent

Thank you! I think this is the one :)