Nielsen was found stabbed to death at a convenience store near the State Famers Market in Raleigh on this day in 2007.
The mother of two, who was 8-and-a-half months pregnant with her third son, was at the store to deliver newspapers.
Raleigh police says its investigation remains active and they still receive phone calls about the case and continue to chase leads.
There is a composite sketch of a person who is considered a person of interest. Click here to see the sketch.
The family is offering a $15,000 reward for an arrest and conviction. Anyone with any information is asked to call the Raleigh Police Department at (919) 227-6220.
You also can log on to Justice4Jenna.org for more on her life and the case.