Nicole Glass and Melissa Mason cold case: Murder victims' families once again asking for help

PHOENIX - Nearly 13 years since two women were found strangled to death, there are still no answers. Phoenix Police are reminding the public about Nicole Glass and Melissa Mason and there's a billboard shining a light on this cold case near 7th and Jefferson streets.

Both Nicole and Melissa were 27 years old at the time, roommates and friends.

Now approaching the 13th year since the murders, investigators don't have any leads. They need someone who knows what happened to speak up, or even better, the killer to finally come forward.

Rachel Glass has done this enough times. Standing in a parking lot, asking the public for information leading to who murdered her daughter, Nicole. There are simply moments she won't get to make.

"Being a grandma. I won't have that."

Because Nicole is now a memory. On December 3, 2010, she and her pregnant roommate, Melissa, were strangled to death and found in their apartment near 42nd Street and Thomas Road. 

More than a decade later, their loved ones don't know who is responsible.

"Absolutely nothing.. it's like this close to being closed. They don't actually close the case, but they actually shelve it.. they don't have any information," said Rachel.

Phoenix Police confirm the suspect is unknown, with no details to provide on the person's connection to the victims.

"Detectives may have a running theory, but we don't know exactly what happened and that's the unfortunate part and that's what's causing this living nightmare for Rachel is we need to find answers," said Sgt. Brian Bowers.

But the digital billboard is back every year at this time, reminding everyone driving by who Melissa and Nicole are – and a $13,000 reward for information leading to an arrest.

Rachel says she's run out of options, but is never giving up.

"Well, I do this every day.. I mean, seriously, it's my daughter, you know.. it's my child. That's my baby. My first born."

A message to the person who killed her first born – that she's not going anywhere.

"I'm just hoping that somebody has a conscience at this point and will step up and do the right thing."

If you have any information, call Silent Witness at 480-WITNESS. You can remain anonymous. You can receive a reward of $13,000 for tips that lead to an arrest and indictment.