In a rambling, conspiratorial letter addressed to the FBI, alleged assassin Vance Boelter claimed he needed to kill U.S. Sen. Amy Klobuchar so that Gov. Tim Walz could run for the U.S. Senate, according to two people familiar with the contents of the letter.

What to know about man suspected of shooting two Minnesota lawmakers and their spouses, resulting in one couple dying.

It’s not unheard of for state and federal prosecutors to both pursue criminal cases for the same offense, especially in high-profile matters.