Either the man is a lone nut.

Or he's a lone nut and someone whispered something in his ear knowing he'd do it.

It was a mistake to think of Shadwell (Newt never found out if he had a first name) as a lone nut.

Prima facie evidence that the occupant's a "lone nut."

Not the work of a lone nut, then, unless he were a fabulously rich lone nut.

-- Lindh was killed by that familiar figure - a mentally unstable, right-wing lone nut.

I only believe in the illusion of the "lone nuts".

Jimmy begins to suspect the assassination is bigger than simply an angry lone nut.

Now we'd like to dismiss this tragedy as the aberrational act of a lone nut.

They can't buy him or intimidate him so, let's hope a "lone nut" doesn't kill him.