A federal grand jury indicted Vance Boelter on six charges in the shootings that killed state Rep. Melissa Hortman and her husband, Mark, and injured state Sen. John Hoffman and his wife, Yvette.

Vance Boelter plans to plead not guilty to charges he killed former House Speaker Melissa Hortman and her husband after wounding Rep. John Hoffman and his wife, his attorney said.

Acting U.S. Attorney Joseph H. Thompson said the indictment includes a "notice of special findings," which he says is the first step in seeking the death penalty.

Authorities allege Vance Boelter wrote this letter addressed to FBI Director Kash Patel. Below is a transcript of the letter to the FBI that was included in a federal search warrant that was unsealed Tuesday in the case against Vance Boelter:

As I said a couple weeks ago, this isn’t just a murder case it’s a political assassination,' U.S. Attorney Joseph Thompson said in court.

A search warrant announced alongside the indictment revealed more about the alleged assassin’s mindset prior to the pair of shootings.

Accused Minnesota assassin Vance Boelter breaks silence after political shootings: ‘It didn’t involve... Trump stuff’ - The 57-year-old has been charged with the murder of Democratic State House Speaker Emerita Melissa Hortman,