A 16-year-old boy was arrested for the murder of 57-year-old Ying Zhu Liu, who was shot while trying to protect her husband during a robbery in their Manhattan apartment building on September 9. The suspect, along with another alleged thief, followed Liu’s husband into the building and attempted to rob him, leading to the fatal shooting when Liu intervened. This incident marks the second arrest of a teenager in connection with deadly gun violence this week; a 15-year-old was charged earlier for the fatal shooting of 66-year-old William Alcindor in Queens during a gang dispute. Both teenagers face serious charges, including second-degree murder and weapon possession, and authorities are still searching for additional suspects in both cases. Police data shows that teens have been arrested in 12 of the 147 fatal shootings in New York City this year. The tragic events raise concerns about rising youth involvement in gun violence.