Vance Boelter, the man accused of killing a former Minnesota House speaker and her husband last year in what investigators called a targeted act of political violence entered a guilty plea on Thursday after reaching a deal with federal prosecutors that avoids the possibility of a death penalty trial, reports NBC News.

A handwritten letter reportedly found in Boelter’s abandoned car contained a series of claims about Democratic Minnesota Gov. Tim Walz, alleging he “wanted me to kill” U.S. Sens. Amy Klobuchar and Tina Smith so Walz could run for an Senate seat.

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