The words "deny," "defend" and "depose" were discovered by detectives on the shell casings found at the scene where Brian Thompson, the CEO of major insurance group UnitedHealthcare, was gunned down

I downloaded the book, but although it discusses "onerous depositions" as a strategy employed by insurance companies it doesn't seem to be a prominent focus of any chapter.

The longer the company can drag it out, requiring the claimant to provide more and more information, to submit to onerous depositions, or simply to wait, the more likely it is that the claimant will give up and take a very small offer, or just go away.

Elsewhere, discussing an auto insurance claim:

The tactics included requiring the plaintiff and her attorney to answer 237 written interrogatories, even though most of the information asked for had already been disclosed, subjecting her to an eight-hour deposition asking about matters both trivial (every illness she had ever had) and personal (whether she had been sleeping with the defendant), and submitting more than seventy subpoenas to her doctors, employer, auto repair shop, former insurance companies, and every hospital in the Memphis area.

As a rhetorical counter to the proceduralist, reformist politics of the author. Defend the downtrodden. Deny the powerful their comfort. Depose the gods of capital.

Might have just been written on a different bullet he didn't fire or they didn't find. Hard to say.