A new video capturing the moments after Michael Brown was shot and killed by a police officer in Ferguson, Missouri has surfaced, adding further evidence that Brown was trying to surrender in the last moments of his life.

The death of the 18-year-old unarmed African American boy, who was shot by a white police officer on Aug. 9, has sparked national outrage and a string of protests in the St. Louis suburb. The police department maintains that Brown reached for Officer Darren Wilson's weapon before he was fatally shot, however several witnesses say the teen was shot execution style while he was trying to surrender.

On Wednesday, CNN released another video that seems to support witness accounts that Officer Wilson used excessive force when he opened fire. In the new video, which was shot 40 seconds after the shooting, a witness standing about 50-feet away says Brown's hands were raised in the air when he was killed.

"He had his f------g hands in the air," says a man in the video identified by CNN as a contractor doing working in the area. The same worker, who has asked to remain anonymous, also told CNN he heard one gunshot and then another about 30 seconds later.

"The cop didn't say get on the ground. He just kept shooting," the man said.

He added that he saw Brown's "brains come out of his head," before reiterating, that "his hands were up."

The video shows the man holding his arms up in the same manner that Brown was doing.

The other witness, who was also standing by the construction truck, had the same type reaction to the shooting.

Brown "put his hands up," he said, adding that "the officer was chasing him."

The construction worker says he saw Wilson shooting at Brown while his back was turned against him.

Both men also admitted that they did not see how the confrontation from the very beginning. The video presents new evidence into the case, which is being investigated by the Justice Department. A grand jury will decide whether or not Officer Wilson should face charges, reports the Washington Post.