The sisters of slain police officer Neal Thompson, who was shot dead last year by Dezi Freeman, plan to sue Victoria Police over his death. Lawyers for Dianne Thompson and Lois Kirk have confirmed they intend to take legal action following the death of their brother last year.The legal action relates to specialist forces not being deployed to execute a search warrant at Freeman's property at Porepunkah on August 26.Detective Leading Senior Constable Thompson and Senior Constable Vadim De Waart-Hottart were killed by Freeman, and a third officer was injured before the self-proclaimed sovereign citizen disappeared into dense bushland, sparking Australia's largest-ever tactical police operation.That operation ended with the fatal shooting of Freeman at Thologolong, in Victoria's north-east on Monday, after a 3-hour stand-off with police.The legal action comes after the sisters of Mr Thompson expressed disappointment late last year over their treatment by Victoria Police.Ms Kirk and Ms Thompson wrote to Chief Commissioner Mike Bush in December, saying they felt "abandoned" by Victoria Police in the wake of their brother's death.In the letter, seen by the ABC, the sisters said they were made to feel "invisible" by police."From the moment we were informed of Neal's death by a phone call instead of in person, it felt as though the magnitude of the loss had not been understood To be ignored like that during our brother's Full Police Honors funeral was painful beyond words."A spokesperson for Victoria Police said police had met with the sisters since the letter was sent in December."We are continuing to speak with them and they have appointed police liaison officers, both from the Homicide Squad and the local area