Is Taliban released video of Colonel Imam killing a fake?

Last month, Tehreek Taliban Pakistan claimed that it has killed Amir Sultan Tarrar aka Colonel Imam. However, they have not produced the body at that time. Also, a section of media claimed that Colonel Imam has died of heart attack.

Recently, a video has been released to the media showing TTP chief Hakimullah Mehsud (allegedly killed sometime back) standing over Colonel Imam. In another frame, Mr. Imam is standing and another man is firing on him.

While Geo TV showed this video, it covered the last segment that apparently shows the body, lying on the ground.