Death Valley by Eden Francis Compton

Love has a brother ... and his name is hate.
Life was never easy for Marcus, even before his parents' murder/suicide in a seedy trailer park in Florida. Now he's landed in Vegas with his older brother, Mac, hoping to start over. But plans usually go sideways when Mac's involved. He's a mean brawler, and Marcus all too often ends up on the receiving end.
Then Marcus meets Trina—a ray of hope in his sea of despair. He's smitten. Trina, however, has a thing for bad boys, and Mac is as bad as they come.
After an unlikely stroke of good fortune dumps a heap of cash in their laps, their pressure-cooker existence explodes and all hell breaks loose.
Death Valley is a story of how far you can push someone before they finally push back. It's about love, greed, and the wide-open desert where men mostly end up dead.