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
Subway rider, 67-year-old male, was wounded in stabbing on Friday before noon
Twelve hours later, a man was fatally stabbed in neck, torso in southern Queens
Two hours later, a woman, 44, died from stab wounds after she was found
Minutes later, another man, 43, was wounded in stabbing in 181st Street station
Calls grow for MTA to reinstate 24-hour subway service in New York City
MTA workers said they have been assaulted, harassed, and threatened overnight
On August 5, Reggie Frazier, 61, was accosted by assailant at 2:15am
Police said Ramon Garrido, 36, attacked him with milk crate in Upper Manhattan
Frazier suffered a torn tendon in his knee as he was trying to flee assailant
Narinder Kumar, 70, an MTA station agent, was pushed to tracks on December 24
Last July, a train operator and conductor were assaulted at a Queens station
MTA says five workers were assaulted since Cuomo shut down overnight service
MTA head says 24-hour subway service will be restored when pandemic ends