Tags: New Hampshire

Authorities believe they know what happened to a family of four who were found dead at their New Hampshire lake house on Christmas day.

When state troopers arrived at the scene, they found Cynthia Lanchester, 76, on the ground, deceased.

Danielle Dauphinais, 38, pleaded guilty to second-degree murder and two counts of witness tampering in connection with the death of her son, Elijah Lewis.