Police were twice called to the campus dormitory to contain the confrontation, the student said.

WSJ: Attacks Point to New Afghan Conflict

Two days after that attack, on April 17, Kadyrbayev told law enforcement officers that he drove to Tsarnaev's dormitory room on the campus of their southern Massachusetts school and texted to his friend to come down to meet him.

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Neighbor Jane Phelan said the twins' mother recently told her the sisters had moved out of a dormitory and into an off-campus house.

WSJ: Cops investigating after NY college student killed

He is omnipresent on campus, attending everything from faculty awards events to dormitory pizza parties.

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