The 26-year-old Chinese entrepreneur had just pulled his new Mercedes to the curb on Brighton Avenue to answer a text when an old sedan swerved behind him, slamming on the brakes. A man in dark clothes got out and approached the passenger window. It was nearly 11 p.m. last Thursday.

The man rapped on the glass, speaking quickly. Danny, unable to hear him, lowered the window -- and the man reached an arm through, unlocked the door, and climbed in, brandishing a silver handgun.

“Don’t be stupid,” he told Danny. He asked if he had followed the news about Monday’s Boston Marathon bombings. Danny had, down to the release of the grainy suspect photos less than six hours earlier.

“I did that,” said the man, who would later be identified as Tamerlan Tsarnaev. “And I just killed a policeman in Cambridge.”