Syracuse, NY - A guilty plea this morning from a Syracuse area man who murdered a mother and raped her daughter after carjacking the pair outside a surburban Syracuse mall in March.

29 year old David Renz pleaded guilty this morning to first-degree murder and predatory sexual assault against a child. He was promised a sentence of life in prison without parole on the murder conviction and 25 years to life as a sex offender for the assault charge.

The plea bargain however could be withdrawn if the federal government seeks the death penalty.

Renz ambushed Lori Bresnahan of Liverpool and her 10 year old daughter March 14th as they left a gymnastics practice at the Great Northern Mall.

Renz, who was on parole after serving time on a federal child pornography charge, had somehow slipped off an ankle monitor he had wearing since January, said police.

The 10-year-old girlwas raped, her mother was stabbed to death.

The little girl managed to escape and ran from the car. She was found running down the road by two passersby who called for help.