Philadelphia police believe people witnessed the murder, but no one is talking.
"She was full of life. She had so many friends. Everyone she came in contact with loved her and was drawn to her. It was a shame, because she didn't have to die," said the victim's mother, Karen Emery.
22 year old Allison Edwards adopted her dog Zelda after getting a job as a pet groomer. She struggled with drug addiction, and 6 months into her sobriety, her mother says she relapsed.
"I wouldn't let her stay in the house using drugs," said Karen. "I remember the day; it was a Wednesday that she walked away from my house. She didn't even bring her coat."
On Friday, December 3, 2010, she was found strangled inside a two-story apartment on the 3800 block of Glendale Street in Juniata Park.
Police have a person of interest, but not enough evidence to make an arrest. It is believed that several men were inside the apartment.
"We know who it is. It's so frustrating to know that this person is still out there, maybe even hurting other women," said John Apeldorn. "The police know somebody else was in that room at the time, we want that person to come forward and give us that information and clear this case. And we have a reward ready for you."
The reward is $2,500. Anyone with information that could lead to the conviction in this case is asked to call the Citizens Crime Commission at 215-546-TIPS. Your call will be anonymous.
"If someone could just please come forward and say, 'Listen, I know that Allison was murdered by this guy,' and we can put him away so that he can't hurt anybody else," said Karen.