PhD Student Faces Death Penalty for Alleged Murder of Friend's Infant

Nicole Virzi, 30, is accused of killing six-week-old Leon Katz and injuring his twin brother while babysitting in Pittsburgh.

Prosecutors cite torture as an aggravating factor in seeking the death penalty against Virzi.
The incident occurred in June when Virzi was babysitting the twins for close friends.
Virzi maintains her innocence, claiming the injuries were accidental.
Medical examiners determined the injuries were consistent with abuse, not accidents.
Governor Josh Shapiro has pledged not to sign any death warrants during his term.