On May 14, 2016, a house on Ketterhagen Road in Burlington, Wisconsin, was destroyed by a sudden fire and a violent explosion that leveled the home. First responders recovered the remains of three people from the wreckage. One of them was 17-year-old Nicholas J. Chaulkin, a White/Caucasian male.

Investigators from the Racine County Sheriff’s Office determined Nicholas had been shot in the back of the head and ruled his death a homicide; medical examiners noted he had no smoke in his lungs, indicating he was killed before the fire was set. The investigation identified Kimberly Howe, Nicholas’s mother, and a third person among the other victims, but the extreme fire damage made it hard to determine their exact causes of death.

Authorities focused on Kimberly Howe’s 41-year-old boyfriend, Craig A. Lambert, who had been living with the family. Reports say Howe had asked Lambert to move out and she and Nicholas had stayed at a hotel the night before. Investigators concluded Lambert killed Nicholas and Howe and then caused the fire and explosion; Lambert also died in the blaze and the investigation was closed.

Did anyone in Burlington have contact with Nicholas or the family around May 13–14, 2016?