WARNING: Gruesome photos:
The back of the head shot does look like an execution, but that's not the only possible explanation. Ibragim could have attacked one officer, and another could have shot him from behind. It does go to show that there is still a lot we don't know about the interrogation and death of Ibragim Todashev.
Abdulbaki Todashev showed 16 photos to journalists, and proclaimed that his son had been shot six times in the torso and once in the head. As for the photos themselves, if they are doctored, it's an impressive job. We don't know if Todashev's body has been examined or tampered with. Hopefully investigations, whether by detectives or journalists, will uncover the story from start to finish. We may not get that satisfaction, however.
We did learn recently that Todashev was unarmed when he was killed, according to sources. It's entirely possible that the FBI agents acted in good faith and according to protocol, but they ought to explain exactly what happened, whether or not the wounds in the pictures are real, and if so, how they got to be where they are.