On May 21, State Prosecutor Marilyn Mosby announced the revised charges, but the most serious charges – including second-degree murder – remained.
Freddie Gray suffered a severe spinal cord injury in police custody in April and died a week later.
The black man’s death sparked weeks of protests and later riots and looting in Baltimore.
Marilyn Mosby said: “As is often the case, during an ongoing investigation, charges can and should be revised based upon the evidence.”
The grand jury did not return charges on the false imprisonment charges that were brought against some of the officers.
Marilyn Mosby brought the false imprisonment charges earlier claiming that Freddie Gray’s arrest was unjustified and illegal.
However, the grand jury did return new reckless endangerment charges that were not part of the original charges announced three weeks ago.
Marilyn Mosby has said that Freddie Gray’s neck was broken while he was being handcuffed and placed into a police van. She also said that police repeatedly ignored his pleas for medical attention.
The officers are scheduled to appear in court on July 2.
A lawyer for the six Baltimore police officers said they “did nothing wrong”, after criminal charges were announced by Marilyn Mosby earlier this month.
Lawyer Michael Davey said the officers “at all times acted reasonably and in accordance with their training” and accused Marilyn Mosby of an “egregious rush to judgement”.
He also said that the defense team had “grave concerns about the fairness and integrity of the prosecution of our officers”.
Marilyn Mosby rejected a police union request to step aside and appoint a special prosecutor to handle the case.
The grand jury’s decision to bring charges largely similar to Marilyn Mosby’s may quiet calls for her to step aside.
Freddie Gray’s death is the latest in a string of high-profile cases in the US where unarmed black men have died after contact with the police.
After Freddie Gray’s funeral, riots broke out in sections of West Baltimore, prompting city and state officials to deploy thousands of extra law enforcement officers and National Guard troops to keep the peace and enact a citywide curfew.
Baltimore police officers charges:
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