About 6,000 feet above the airport, his said his engine stalled.
He brought his plane onto a grassy field and eventually stopped on
Auld Road outside the airport.
Gross, who has been flying for 12 years, said he wasn't sure the
exact
cause of the aircraft's trouble, beyond the stalled engine, but he
suspected that one of the plane's fuel tanks was empty.

I'm still a student pilot, but the engine-out emergency checklist in
the plane I train in has a step to switch fuel tanks (and run fuel
pump) specifically to deal with this situation. At 6,000 feet, he
should have had more then enough time to do this if he set best glide,
right? If it turns out that he was sucking on an empty tank and that's
the only problem, then this sounds like evidence that he didn't do his
checklist, or is that step not standard in Bonanza's?

Again, I'm just a student pilot, so if I'm wrong, lemme know.