Mia Tretta, now 21, was a high school freshman at Saugus High School when a student shot five students and later himself. Her healing journey led to Brown University, where after last week’s

Here is a timeline of key moments of the investigation through Thursday: 4:05 p.m.: At least two people were killed and nine others were injured in a shooting at Brown University's Barus and Holley Engineering Building, 184 Hope St., Providence.

Thursday, Dec. 18, concluded with Providence, state and federal authorities announcing that the suspect had been located and was found dead in NH.

The effort to find a man who walked onto Brown University’s campus and shot nearly a dozen students in a crowded lecture hall has raised serious questions about the school’s security systems and the urgency of the investigation itself.

His detailed tip helped lead investigators to the gunman behind the deadly Brown University shooting – but whether the tipster known only as “John” will ever receive the $50,000 reward offered by the FBI is still an open question.

It was four days after the Brown University mass shooting that Providence Police posted a photo of an unidentified individual writing, "investigators are asking for the public's help in identifying and speaking to the individual shown in this photo who was in proximity of the person of interest.

Providence residents went days without knowing who the gunman behind the Brown shooting was, or whether he was still among them.

In the wake of the Brown University shooting, parents and future students are worried about safety when it comes to attending school.