A weekend of violence in Chicago left nine dead and 37 others injured in shootings that have tested the police's anti-violence strategy. Supt. Garry McCarthy told NBC Chicago on Monday that tighter gun laws are needed, and though the department's tactics are taking root, some retaliation shootings "are happening quicker than we have been able to get in front of them." McCarthy said some of this weekend's shootings were in retaliation for violence that happened up to a year ago. Among the deceased was 30-year-old Noah Cruise, who was shot in the chest Friday on South Wallace Street. A few hours later a 23-year-old was sitting in his car with his girlfriend on South Drexel when he tried to fight off two armed robbers. The man was shot multiple times and later died. One of the latest shootings involved a 19-year-old boy who was shot in the head Sunday on Champlain Avenue. Chicago's summer violent streak started Memorial Day weekend when more than 40 people were shot.