Mitch Rapp Act of Treason Question that I can't find the answer to

[Marsha]

Act of TreasonVince Flynn

Hi,

I'm reading Act of Treason by Vince Flynn right now and at one point Kennedy says that Mitch was institutionalized against his will and he broke the neck of the person who did it. Was this an actual event that took place in any of the novels or was that the only time it was mentioned?