Ms Francis was in a volatile relationship with John Torney, who lives in a separate house in Oram Court. Mr Torney has repeatedly posted on social media - as recently as June 1 - that he had broken off the relationship with Ms Francis, which started after she separated from Nikki's father in February.
Mr Torney is also a father, but it is not believed his children live with him in Oram Court.
Neighbours had been fearful of Mr Torney, who had lashed out at them previously.
He was due to face the Mildura Magistrates Court on Wednesday in relation to a criminal matter, and is listed to appear again in September. His alleged offending does not involve children.
Nicholas Coslovich, Nikki's father, also has an upcoming appearance in the same court, relating to a court-ordered diversion program.
He told Fairfax Media he was charged in relation to "smacking" Nikki's oldest sister, an offence that was reported to police when a teacher at the girl's primary school noticed a bruise on her leg.
He said he immediately regretted hurting his daughter and had done everything he could to make her feel better.