The father of Michael Brown, a black teenager killed in Ferguson, Mo., by a white police officer five years ago in an incident that sparked massive protests, is calling for St. Louis prosecutors to reopen the probe into his son's death.

The Associated Press reported Friday that Michael Brown Sr. said at a press conference Friday that he is asking St. Louis County's first black prosecuting attorney, Wesley Bell, to reopen the case. His press conference coincided with the fifth anniversary of his son's death.

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“Justice has not been served,” Brown said, according to the AP. “My son deserved to live a full life. But a coward with a badge ... chose not to value his life.

“My son was murdered in cold blood, with no remorse and no medical treatment," he added.

A grand jury chose not to indict the officer, Darren Wilson, on charges of murder. The Justice Department under President Obama also declined to prosecute Wilson, declaring that he had likely acted in self-defense when shooting the younger Brown.

Bell took office in January after defeating a seven-term incumbent in an upset victory that many supporters hoped would result in positive reform in the local criminal justice system.

Since taking office, Bell has directed his office to investigate past convictions and possibly overturn them if the public lacks confidence in the integrity of the judgments.

"The obligation of every prosecutor is to pursue justice, an obligation that cannot be met if the public lacks confidence in the integrity of criminal convictions," he said earlier this year.