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