Rosie Batty has said she has "a degree of closure" after an inquest found her son's death at the hands of his father could not have been foreseen.
Luke, 11, was bashed with a bat and stabbed to death by his father Greg Anderson at a public cricket ground in Tyabb, outside Melbourne in 2014.
The case forced domestic violence onto the national agenda in Australia.
Coroner Ian Gray found Anderson was "solely responsible" for Luke's death and did not blame authorities.