Connecticut lobbyist, Janemarie Murphy, was stabbed by her 12-year-old son, who also turned on his twin sister, fatally stabbing her to death. The boy has been charged with one count of murder and one count of first-degree assault, according to Fox News.

The name of the boy has not been released, but he was arraigned on Tuesday at the Connecticut Children Medical Center, where he was being treated for minor injuries, the news outlet reported. Murphy, 56, was seriously injured in the attack and the boy’s twin sister, Brigid Curtin, 12, was killed, the Hartford Courant reported.

A 911 call came into the West Hartford police at around 3:30 p.m. Monday from a woman who said her son stabbed her and her daughter, Fox News reported. When officers arrived at the scene, all three members of the family were present, and they were immediately rushed to the hospital where Curtin later died, according to the news outlet.

The girl’s death was ruled a homicide by the state medical examiner on Wednesday based on the stab wounds to her neck and torso, WTIC-TV reported.

Murphy, who was reportedly in the hospital in stable condition, is a lobbyist for Murtha Cullina LLP. The law firm released a statement to the Hartford Courant about the incident.

“We are devastated by the horrific tragedy affecting our friend and colleague Jane Murphy. Jane has been a valued member of the Government Affairs Group of Murtha Cullina LLP for over 24 years. We are doing all we can to support Jane and her family, and ask everyone to please respect their privacy during this extraordinarily difficult time.”

Condolences for Murphy and her family also came from Connecticut Sen. Chris Murphy as he tweeted, “My heart is sick for my friend Janemarie Murphy and her family. What an unfathomable loss. I know the community of West Hartford and her legions of friends at the State Capitol are rallying to her side to make sure the family has all they need.”

West Hartford Mayor Shari Cantor released a statement from the family which read, "We are all enduring a very painful and unimaginable loss. Our family will never be the same. Our daughter was a beautiful child and we will remember forever her smile ... laughter . and remember her for the way she loved and lived."

The motive of the attack remains under investigation. Both the boy and his twin sister attended Sedgwick Middle School, according to Fox News.