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Jane Flavell Collins/Associated Press photo
In this courtroom sketch, Khairullozhon Matanov appeared in federal court before a magistrate judge.
An undated photo of Khairullozhon Matanov.
Matanov was arrested by federal authorities.
Wendy Maeda/Globe Staff
Khairullozhon Matanov, 23, lived at an apartment complex in Quincy.
Ahmed Goutay said he knew Khairullozhon Matano from the Islamic Center of New England mosque in Quincy, where both studied.
Matanov frequently waited for fares outside Braintree MBTA station.
Cabdriver Bill Walker said he frequently chatted with fellow driver, Khairullozhon Matanov, outside Braintree MBTA station.
The Quincy cabdriver was a friend of slain Marathon bombing suspect Tamerlan Tsarnaev.
Matanov allegedly talked to Tamerlan 42 minutes after the Marathon attack.
Resident Tyler Young, 27, said he was stunned by the accusations. “It’s shocking,” he said.
The front door of the apartment on Common Street where Matanov lived.
Neighbor Leslie Aiello, 49, said Matanov was a mysterious figure who never said hello.
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