Investigators are still trying to determine the motive behind two shootings in New England after the suspect was found dead last night.

The man who killed two students and injured nine others at Brown University was located in New Hampshire last night, following a manhunt that ended at a storage facility.

Authorities say they were able to link the suspect to the murder of an MIT professor who was killed in his home on Monday.

Stephanie Sy has the story of how one anonymous tipster changed the course of the investigation.

He blew this case right open. He blew it open.

A crucial tip from a Reddit user is what led authorities to identify the gunmen, bringing almost a week-long

manhunt to an end. Law enforcement collectively believe that we have the person, that we identified the person,

and that person is dead, and that he was the person responsible not only for the Brown shootings,

but for the Brookline shooting.

The Reddit tipster, known as John, told police he had suspicions about a man he'd seen hours before the shooting in the bathroom of the engineering building.

We now know that man was Claudio Valenti. John said he followed Valenti after he left the building to a Nissan with a

Florida plate. The police affidavit describes an interaction between them, with John describing

Valenti as saying, I don't know you from nobody. Why are you harassing me?

Hours later, the suspect killed two students and wounded nine others in the engineering

building.

John's observations enabled police to tap into a network of over 70 street cameras around

the city.

When you do crack it, you crack it.

And that person led us to the car, which led us to the name, which led us to the photographs of that individual

renting the car, which matched the clothing of our shooter here in Providence, that matched

the satchel.

Police tracked Valenti to a storage unit in Salem, New Hampshire, where he was found dead

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