A triple murder investigation led by the FBI is potentially linked to Boston Marathon bombing suspect Tamerlan Tsarnaev. Clandestine actions by the FBI leave friends and family members linked to the suspect with more questions, and a community is left wondering: Could solving this case have prevented the Boston Marathon bombings?

Anonymous FBI sources gave numerous accounts of Ibragim’s death to the press, managing to be both vague and contradictory. The agency claimed that, just before being shot, Ibragim had been sitting at a table, about to write a statement that would implicate both himself and Tamerlan in the Waltham murders. In some reports, he lunged at an FBI agent with a knife, while others said he used a pole or a broomstick. It was an agonizing development: The FBI claimed he had been killed at precisely the moment he was about to give the answers so many of us had been waiting for.

Whatever occurred in Ibragim’s apartment the night he was shot dead, his death put the FBI on the defensive. The agency quashed the coroner’s report, leading media outlets and the American Civil Liberties Union to call for an independent investigation. On its editorial page, the Globe declared that “the agency’s credibility is on the line” due to its lack of accountability in Ibragim’s death. Ibragim’s father accused the agency of “premeditated murder” and released photos of his son’s bullet-ridden corpse, showing that he’d been shot in the top of the head—even though the FBI contended that one of its agents had fired in self-defense. Instead of providing answers, the FBI’s investigation of Ibragim had turned into a sudden dead end.