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.

Federal prosecutors on Tuesday are expected to a grand jury indictment against Vance Boelter, the man accused of shooting two Minnesota state lawmakers and their spouses.

Vance Boelter faces federal charges for allegedly murdering former Minnesota House Speaker Melissa Hortman and her husband, with prosecutors calling the attacks 'targeted political assassinations.'