Nancy Kerrigan’s father’s death will be treated as a homicide, the Middlesex, Mass. District Attorney confirms to People. A statement from the DA’s office read in part: “The Medical Examiner determined that the cause of death was cardiac dysrhytmia following a physical altercation with neck compression causing injury to the neck in the form of a cartilage fracture to the larynx area, in a person with hypertensive and atherosclerotic cardiovascular heart disease.”

Daniel Kerrigan, 70, was pronounced dead on Jan. 24, after having a violent altercation with his son, 45-year-old Mark Kerrigan. Mark Kerrigan was charged with assault and battery with a dangerous weapon on an elderly person and causing serious bodily injury. The DA’s statement today also noted: “As a result of these conclusions of the Medical Examiner, the investigation into Daniel Kerrigan’s death, and whether any charges in connection with his death are appropriate, remains ongoing.”