NEW ORLEANS -- A man wrongfully convicted of murder filed a formal complaint against the Orleans Parish District Attorney's office.

Advocates for changes in New Orleans' criminal justice system held a news conference Tuesday to discuss their request that the U.S. Justice Department look into wrongful convictions.

Among those set to attend Tuesday's event is activist John Thompson, who spent 14 years on death row before he was exonerated in a 1984 murder case.

Thompson and others plan to call on the Justice Department to investigate. They claim authorities at the state and local levels have failed to address widespread prosecutorial abuses.

John Thompson was wrongfully convicted in the 1984 shooting death of Ray Liuzza, a hotel executive from a prominent New Orleans family.

After 18 years in prison, 14 spent on death row in solitary confinement at Louisiana State Penitentiary, he was exonerated.