The Police Department's internal investigation, which was completed in August 2018, also found that Mellone violated the policy governing "ranged impact weapons."
Civil rights attorney Adante Pointer, who represented Góngora's family in that lawsuit, said information that the officers violated policy was never turned over, and is now public only after the lawsuit was settled.
"They owe us honest conversations and information, period," Pointer said.
The final determination on the misconduct and discipline appears to still be pending.
The Police Department's Firearms Discharge Review Board sent the case back for further investigation in March of this year, and it's scheduled to be reconsidered in the next few weeks.
The internal Police Department investigation found no fault with Sgt. Steger and recommended training for both officers. The Department of Police Accountability, however, found that Steger failed to supervise Mellone and recommended the sergeant be suspended for a month.
As part of its probe, the oversight agency hired private consultant Michael Gennaco to review the shooting.
"As a supervisor, it was (Steger's) responsibility to instill concepts of ‘time and distance’ at the scene as expressly set out in the department’s training bulletin; in this case Sgt. Steger did or said nothing to advance these principles," Gennaco wrote in his report, finished in April of this year. “Had the sergeant performed consistent with department expectations of a field supervisor, the need to resort to deadly force could well have been avoided. Accordingly, a case can be made that Sgt. Steger should be held accountable for the supervisory lapses that impacted this tragic result.”
Department of Police Accountability Director Paul Henderson recommended that the ultimate discipline in the case be decided by the city's Police Commission, which handles cases involving potential punishments more severe than a 10-day suspension. He also requested a meeting with Police Chief William Scott before any final decisions on the case are made, according to the records. If Scott disagrees with the oversight agency's recommendations, Henderson can file the case directly to the Police Commission.
The Police Department did not immediately respond to questions seeking to clarify how the disciplinary process will proceed.
"We're in the process of making appointments with the DPA and chief of police so the family can express their demands to them directly," said Adriana Camarena, an advocate for Góngora's family. "We will also attend the next Police Commission meeting to make sure the commissioners act to ensure consequences."
This story was produced as part of the California Reporting Project, a collaboration of 40 newsrooms across the state to obtain and report on police misconduct and serious use-of-force records unsealed in 2019.