Vance Luther Boelter, the man accused of killing a Minnesota lawmaker and her husband and injuring another couple, planned the attacks for months and had dozens of apparent targets, prosecutors said Monday.

St. Cloud State graduate Vance Boelter appeared in federal court Monday afternoon. He is assigned a public defender, citing financial woes.

Here’s what we know about the 57-year-old charged with the murders of state representative Melissa Hortman and her husband and shootings of state senator John Hoffman and his wife.