Crime Fighters: Who murdered Iris Tyson?

PHILADELPHIA - October 8, 2011

Kelly and Joseph Tyson are parents on a mission. Their 23-year-old daughter, Iris, disappeared on Mother's Day May 8th after leaving her South Philadelphia home.

"She said I'll be right back. I'm gonna go get a mother's day gift," explained Iris' grandmother Florence Murtha.

Iris never returned. After a massive search, her body was found on May 15th, about two miles from her home in a vacant lot between Sydenham and Hick streets in South Philadelphia. She died from blunt force trauma to the head.

Murtha says, "I remember driving around looking for her and thinking 'you're so close, but where?' You need me and I'm not there to help you. And I apologized to her for that. That I wasn't there to help you."

"My daughter didn't stay away from me. I was her best friend and she was my best friend. And that's all I had. And you took it away," said Kelly.

Police have ruled Iris's death a homicide. The family is offering a $3,500 reward. They are hoping someone will come forward with information. Make that anonymous call to 215-546-TIPS.

As Kelly Tyson clutched the cuddly toy her daughter slept with every night, she made this emotional appeal: "If you know something, anybody, or if you've seen something or even the person that did this, I will find it in my heart to forgive you."

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