Peter Bradley Adams, "Darkening Sky"
Apparently it was on The Mentalist, which I don't watch (so I wouldn't know). I found it a while ago among Amazon's freebies. (There are more than are listed on that page, too, but at the moment I can't find an easy way to see them all listed... Just click on a freebie and more are usually recommended somewhere on the new page.) If you're looking for new (free) music, it's a good place to start, and the offerings change regularly. Never know what you'll find!