An accused killer took the stand in his own defense Wednesday and not only does he say he didn't do it -- he said the State Attorney's office is conspiring against him.

David Damus, 22, is accused of taking part in a deadly shooting spree in Osceola County two years ago.

The trial got underway Monday.

The third day of the trial was all about what physical evidence the state has in the case against Damus, who is accused of trying to rob Eric Roopnarine on July 4, 2013.

Damus was later charged with first-degree murder in Roopnarine's death.

Damus is also accused of being involved in a series of shootings in 2013 when 17-year-old David Guerrero was shot and killed on his way to a bus stop.

The so-called ringleader in the spree of shootings is Konrad Schaffer, who was just 15 years old at the time.

"What happened to Eric is messed up, man, and he deserves justice, but I'm not the one who did it to him," said Damus on the stand Wednesday.

Although Damus admitted he was there on July 4, 2013 when 22-year-old Roopnarine was shot and stabbed to death, he said he was just there to make sure his new friend, Victoria Rios, didn't run into any problems when she prostituted herself to Roopnarine.

But that's not what happened, and he claims it was Schafer who was the one behind the murder.

"But he opened the door, he came inside with the rifle and then I-- well I didn't know who it was," said Damus. "So pushed the rifle away and that's when I saw that it was Konrad."

Damus claimed that's when he walked away and Schafer killed Roopnarine. And the only reason Damus agreed to help rob Roopnarine was because he was scared.

"Because he's standing there with his rifle and he just killed somebody. I'm doing what he says," Damus said.

But all day the State Attorney's office has worked to prove that the physical evidence shows Damus was there during the murder and the shooting sprees.

They used shoe imprints and ammunition found in the vehicle Damus admits he drove during the shooting spree.

But Damus said all the evidence can be expained because he hung out with Schafer socially. He said any testimony against him by his friends was coached because he said the State Attorney Jeff Ashton is out to get him.

"You think that my public persona is affected by whether we convict you personally?" Ashton asked.

"Yes, because when you lost the Casey Anthony case that made you look bad," Damus said.

Damus was the key witness in his own defense. He face a first degree murder charge.

The state is trying to connect the ammunition and the guns to Damus because they were technically purchased by Schaffer's father, Lothar Schaffer.

Closing arguments will begin Thursday.

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