Oscar Perez

Force in Play

Leading an expanding investigation relying on neighborhood footage and public tips; authorities are now also assessing a possible link to the killing of an MIT professor

Brown's Dec. 13 shooting evolved from a campus lockdown into an extended manhunt. Gunfire killed two students—Ella Cook and Mukhammad Aziz Umurzokov—and wounded nine others; the initially detained suspect was released, and investigators have used residential and vehicle-camera footage to track the shooter's movements.

Updated May 15