Rigoberto Lopez, 21, was taken into custody by New York City police on Saturday Police sources said Lopez, who is mentally ill, was charged on Sunday with murder and attempted murder after confessing to four separate attacks Claudine Roberts, 44, was identified by her father as one of the victims who died from the attack after she was stabbed multiple times Authorities said a man was also fatally stabbed in neck, torso in southern Queens Subway rider, 67-year-old male, was wounded in stabbing on Friday before noon Another man, 43, was wounded in stabbing in 181st Street station, police said Lopez is now being held without bail, according to New York City police