The suspected assassin accused of killing a Minnesota lawmaker and her husband seemingly bragged about the slayings in a chilling text to his family.

Vance Boelter, 57, allegedly impersonated a police officer and then shot dead Melissa Hortman, the top Democrat in the Minnesota House, and her husband, Mark, in their home on Saturday night.

He is also suspected of shooting and wounding state Senator John Hoffman and his wife Yvette at their home a few miles away.

Boelter, who officials say meticulously planned the attacks, did not appear to have any remorse for the murders, which he alleged were an act of 'war'.

The suspected killer texted his wife Jenny and other family members shortly after he attacked the legislators, according to a federal criminal complaint.