Here's the account. I see no motive for shooting him unnecessarily.
Todashev's questioning and death:
In the afternoon of May 22, 2013, law enforcement officers, including an FBI special agent from the Boston field office and two Massachusetts State Police (MSP) troopers, arrived at Ibragim Todashev's apartment in Orlando, Florida, and interviewed Todashev for approximately eight hours in his living room. According to Todashev's father Abdulbaki, the questioning took place two days before his scheduled flight to Russia; Abdulbaki's American attorney Eric Ludin said Ibragim had underwent multiple prior interrogations in Florida and was promised this would be the last one, and had canceled a planned trip to Chechnya earlier in May on the advice of the FBI.[13][18] Todashev was questioned by the FBI agent regarding the 2011 Waltham murders and his connections to the Boston bombings suspect Tamerlan Tsarnaev;[5][19] both Todashev and Tsarnaev had trained at the Wai Kru MMA Gym and lived close to each other in Cambridge, Massachusetts.[9] The investigators later said that Todashev implicated both himself and Tamerlan Tsarnaev in the murders during the questioning soon after midnight. They reported that Todashev was beginning to write a formal statement when he asked to take a break, and then suddenly attacked the agent.[5][19] Todashev was shot multiple times and killed.[5][20][21]
Officials initially claimed that Todashev picked up a knife or attempted to grab a samurai sword from the wall, but later said that it was unclear whether this was the case; one source said it was "a knife or a pipe or something". A number of later reports said that he was unarmed.[20][21][22][23] Some earlier accounts implied that the FBI agent was alone with Todashev at the time of the shooting.[21] Following Todashev's death, his father showed photographs to reporters in Moscow that he said demonstrated his son had been shot at point-blank range in the head.[24] According to the account of an unnamed law enforcement official, Todashev knocked the interrogating agent to the ground with a table, and then lunged at him with a metal pole, or possibly a broomstick.[25] In this account there was one detective in the room—who did not fire—besides the FBI agent.[25] The agent sustained minor injuries requiring stitches. An account given by former FBI deputy director John Miller said[26] that an MSP trooper "noticed that Todashev was getting more and more agitated. Rather than alert the agent and tip off Todashev that they sensed something was about to happen, [the trooper] texted the agent and [wrote], 'Be careful, I think this guy is becoming more agitated'. As the agent looked down at that text, that's when the table went over, Todashev came over the table and picked up apparently a metal broom handle or some object like that [...] and charged the agent. The agent [w]as knocked back, came up with his gun, fired two or three times. Todashev came back at him and he fired more times." Authorities have confirmed that the agent fired six times.[26]
A police report states that the FBI confiscated "some kind of stick" along with a computer and some other items.[18] The FBI established a post-shooting incident-review team to investigate the shooting.[19] Todashev's body was flown to Russia on June 20 by his American widow and his father;[27] he was buried in a Muslim cemetery in Grozny on June 29.[28] On July 16, the release of Todashev's autopsy report, completed by a Florida medical examiner's office, was blocked by the FBI because the "case was still under active investigation."[29]
http://en.wikipedia.org/wiki/Ibragim_Todashev
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