A suspect is in custody after Minnesota state Rep. Melissa Hortman and her husband were fatally shot Saturday, while state Sen. John Hoffman and his wife were wounded.

Melissa Hortman and her husband, Mark, were killed by an individual impersonating a police officer. Hortman was the former speaker of the Minnesota House of

Vance Boelter is charged with the assassination of Minnesota Senator Melissa Hortman and the fatal shooting of her dog, Gilbert.

Melissa Hortman, a Minnesota lawmaker who was gunned down in what is described as a politically motivated attack, earned degrees at Boston University and Harvard.

He wounded Sen. John Hoffman and his wife but didn’t come into contact with the two other DFL legislators, investigators say.

The children of Melissa Hortman and her husband Mark Hortman are speaking out on their parents' murders. “They were the bright lights at the center of our lives, and we can’t believe they are gone," Sophie and Colin Hortman wrote in a statement obtained by PEOPLE Monday.

Lawmakers and officials, both local and national, are issuing statements expressing shock and outrage over the shooting deaths​ of Minnesota state Rep. Melissa Hortman​ and her husband.

As shooting suspect Vance Boelter faced a judge Monday, friends and loved ones of shooting victims Mark and Minnesota State Rep. Melissa Hortman continue to share tributes."Many times, when something tragic happens,