CHICAGO (CBS) — Attorneys for a teenager who was shot and killed by a Chicago police officer three years ago have asked the U.S. Justice Department to review the case.

Christian Green, 17, was shot and killed on July 4, 2013, in the 5600 block of South State Street.

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At the time, police said the teenager was shot in the chest after pointing a gun at officers, but his mother said an autopsy revealed he was shot in the back.

“I want to know the truth. What really happened to my son?” Patricia Green said.

Green family attorney Victor Henderson said the city should release all records related to the case, including video of the shooting captured by a surveillance camera at a nearby liquor store.

“In that tape, we see Christian fleeing. We also see what appears to be an object that appears to be a gun. I don’t know that,” he said.

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Henderson said there are a number of conflicting accounts about what happened, and he said the public deserves to hear all the facts.

“All we want is the truth, and that’s where we should be at this point in time in the city of Chicago. Let’s just get the truth. That’s what we want,” he said. “If young Christian was doing something that he wasn’t supposed to do, then Mrs. Green will have to deal with that. Conversely, if the police were doing something, if those officers were doing something they shouldn’t have been doing, then we need to know that, too.”

He also wants the Justice Department to investigate the shooting.

According to published reports, the officer who shot Christian Green is the partner of Officer George Hernandez, who shot and killed another young black man, 25-year-old Ronald Johnson, who fled from police responding to a carjacking in October 2014.

Just days after Johnson was killed, another Chicago police officer shot and killed 17-year-old Laquan McDonald. Officer Jason Van Dyke has been charged with first-degree murder for shooting McDonald 16 times, with most of the shots being fired after the teen fell on the ground.

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Prosecutors have declined to charge Hernandez in Johnson’s shooting.