The execution-style killing of Lois Tolley will feature on tomorrow's episode of Police Ten 7.
The 30-year-old was stabbed and shot at point-blank range in her Ward St, Upper Hutt, home in December last year.
There is still a dedicated, professional team working hard on the case and determined to find those responsible, police said.
More than 100 people had been spoken to by police and statements obtained.
Hours of CCTV footage is still being worked through with positive results by the Operation Archer team.