When will the public learn the whole story about the shooting of Ibragim Todashev? An FBI agent killed Todashev under mysterious circumstances during an interrogation in Florida on May 22, just as the 27-year-old Russian seemed to be on the verge of revealing important information about Marathon bombing suspect Tamerlan Tsarnaev. After the shooting, the agency promised a full investigation. But after two and a half months, no information has been forthcoming. If the bureau won’t provide a full accounting, the other agencies involved should produce one instead.

Investigators had zeroed in on Todashev, a martial arts fighter and friend of Tsarnaev’s, in hopes of gaining information about a 2011 triple homicide in Waltham in which Tsarnaev and Todashev may have played a role. Solving that crime would not only grant some closure to the families of the victims, but provide a fuller picture of Tsarnaev in the years leading up to the bombing.

What exactly happened at Todashev’s Orlando apartment that night has been shrouded by conflicting accounts. After days of questioning, Todashev had reportedly implicated himself and Tsarnaev in the Waltham murders. In one version of what occurred next, Todashev attacked the FBI agent with a blade; in another version, he lunged at him with a metal pole or broomstick; in a third, Todashev was unarmed. The medical examiner in Florida completed a report on Todashev’s death, but the FBI has prevented the examiner’s office from releasing its findings to the public, citing the ongoing investigation.