Danielle Madgwick, 23, died of stab wounds at a Ziegler Avenue home in Wagga Wagga, NSW, about 11.45am on September 19.
Her alleged partner, 31, was arrested that evening and charged with murder. His matter remains before the courts.
Detectives executed a search warrant at a Ziegler Avenue home about 7am on Saturday and arrested three people at the property.
Two men, 18 and 56, and a woman, 53, were taken to Wagga Wagga police station and charged with a count each of accessory after the fact to DV murder.
All three were known to the woman, police allege. They were refused police bail and appeared before a bail court that day.
The trio was again refused bail to appear before a local court on December 23.
A detective is set to address media later on Monday.
Domestic Violence NSW chief executive Delia Donovan previously told AAP women in regional areas faced unique barriers to safety. Housing shortages, long distances, limited transport, workforce shortages and inadequate justice infrastructure pose additional risks, she said.
Several matters remain before the courts after a horrific spate of alleged domestic violence attacks in September and October.
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