PHOENIX - No mother ever wants to have to visit their child at a gravesite, six-feet under.
But Pamela Coss has no other choice.
Her 19-year-old son, Fabian Cano was killed two years ago in a drive by shooting.
"It's very hard. I don't want to have to visit him here," cries Pamela as she changes flowers out at Fabian's grave.
In January of 2012, Fabian was at a party near 79th Avenue and Indian School Road in Phoenix when a shooter fired random shots into crowd.
Fabian was clear in the backyard, but a stray bullet made its way in and pierced his head.
"It's the worst phone call you can get," recalls Pamela of the chilling moment she learned about her son.
Two days later Fabian died.
The shooter has never been found. There are no leads and no suspects. As each year passes, not knowing who killed her son becomes more painful.
"People say 'with time it gets easier.' No it doesn't. I need to know who this person is and tell him how he destroyed my life," sobs Pamela.
Her agony is so deep, her cries so desperate, it cuts through you like a knife.
Then comes a piercing twist. It isn't the only chilling phone call Pamela would receive.
18 months after the death of her son, Pamela's sister Susan called her.
Pamela instantly recognized the pain in her voice.
Susan's daughter, and Pamela's niece, Adrienne Salinas had gone missing. Adrienne was last heard from in June of 2013 when she called a cab to pick her up.
"I dropped down to my knees and I prayed 'not again,' but it was happening again to us," said Pamela.
In August of 2013, Adrienne's body was found near Apache Junction. Her death listed as suspicious. And again, no suspects and no leads.
Both cousins were 19, 18 months apart in age and murdered 18 months apart in two separate unsolved crimes.
And now both their mothers are left begging for answers and praying for justice.
"It's terrible. It's so hard. They didn't deserve to be murdered. They were our children," Pamela said as she wipes the tears from her face.
Pamela is asking anyone with information to come forward.
In Fabian's, case 50 teens were at the party where he was shot. Adrienne was last seen at a party held at her apartment.
"I know it's hard to get involved. But please give my family the peace to move forward. I need that," pleads Pamela.
Pamela will never get her son back. She knows that, but she wants that moment in court to face both her son's killer and her niece's killer.
"I'm not going away. I'll do whatever it takes. I want justice," said Pamela.
If you have any information on either of these two cases, please police or Silent Witness at 480-WITNESS.