A 23-year-old was arrested and charged with murder after one person was killed and two more were wounded by gunfire. Officials said people dining at the club intervened to stop the shooter.

© Michael Casey/Associated Press

Three police officers were killed and two others were injured in York County after encountering a man who was suspected of stalking a former girlfriend.

© Kriston Jae Bethel for The New York Times

The 22-year-old accused of killing Charlie Kirk is being held on suspicion of felony murder. Prosecutors expect to file formal charges ahead of his court appearance.

© Kim Raff for The New York Times

The 22-year-old accused of killing Charlie Kirk is being held on suspicion of felony murder. Prosecutors expect to file formal charges ahead of his court appearance.

© Kim Raff for The New York Times

Brent Simpson is the first police officer known to have C.T.E. He showed signs of the disease in the last few years of his life.

© Travis Dove for The New York Times