Victoria Kotlinski was 7 when she and her mother, Ania Kosinska, were found dead in their Chicago home on September 28, 2014. Both victims had been stabbed, and Victoria’s death is listed as a homicide.

The suspect was Victoria’s father, Maciej Kotlinski, who was charged with two counts of first-degree murder. Neighbors told police the couple often argued; the motive for the killings has not been established. Officers say a concern for Maciej’s welfare after he reportedly showed suicidal behavior led to a well-being check that uncovered the crime.

If anyone knew the family, observed disturbances in the neighborhood around late September 2014, or has information that could clarify what happened, please share what is known with investigators.