The murders were planned and committed by the family's 12-year-old daughter and her 23-year-old boyfriend Jeremy Steinke, now going by the name Jackson May.
According to friends of the daughter, the girl's parents had punished her for dating Steinke,due to the age difference. This is believed to be the motive.
Under the Youth Criminal Justice Act the name of the daughter could not be used in Canada after she became a suspect. Under the same act, twelve is the youngest possible age at which a person can be charged with a crime; convicts who were under fourteen years of age at the time they committed a crime cannot be sentenced as adults, and cannot be given more than a ten-year sentence.
On July 9, 2007, the girl, who had by then turned 13, was found guilty of three counts of first-degree murder in the killings.She is the youngest person ever convicted of a multiple murder in Canada.
On November 8, 2007, she was sentenced to the maximum penalty of ten years imprisonment. Her sentence included credit for eighteen months already spent in custody, to be followed by four years in a psychiatric institution and four-and-a-half years under supervision in the community.
Steinke admitted to the murder of the parents in conversation with an undercover police officer while in custody. He was tried in November 2008 and found guilty by a jury on three counts of first-degree murder for the killings. On December 15, 2008, Steinke was sentenced to three life sentences, one for each first-degree murder count. Steinke will be eligible for parole after serving twenty-five years.