A Goodyear sergeant accused of misconduct has been disciplined and another officer may face discipline over her conduct in a fatal 2008 hit-and-run investigation, officials say.

Sgt. Deron Miller served an unpaid eight-hour suspension on Nov. 25, the Friday after Thanksgiving, after an independent probe into the Police Department's handling of the case concluded he hindered the investigation, interim Police Chief Bill Cusson said Monday.

The independent report also found Detective Anna Ybarra might have obstructed justice, and the Police Department is conducting an internal probe into her conduct to determine if and how to discipline her. She could face disciplinary action, from a personal performance report to termination.

The department is investigating Ybarra because she wasn't interviewed during the independent investigation, while Miller was, Cusson said. Ybarra still is working as an officer while the internal investigation is conducted. It is expected to be completed within a few weeks, Cusson said.

The independent investigation, conducted by Phoenix-based attorney Paul Charlton, into the department's handling of the hit-and-run death of 18-year-old Jered Pendleton concluded Miller hindered the investigation by not informing investigating officers that Goodyear Officer Bradley Hardin might have been involved and for not immediately seizing Hardin's vehicle. It also faulted him for failing to write a supplemental report.

The report also faulted Miller for failing to write a supplemental report.

It said Ybarra might have obstructed justice when she called Hardin two days later to tell him officers were coming to his house to seize his vehicle.

Cusson said Miller was given the suspension for violating the Police Department's neglect of duty policy by not writing a supplemental report. He said Miller will not be disciplined for his failure to seize Hardin's vehicle because "the city has taken the standpoint that he is a trained accident reconstructionist (and) he discounted the vehicle as being involved that night."

Goodyear hired Charlton, a former U.S. attorney for Arizona, to conduct the investigation into the Police Department's handling of Pendleton's death.

The report was completed in March and upon reviewing Charlton's findings, officials asked the state Department of Public Safety to investigate possible criminal charges against officers named in the report. The DPS submitted its investigation to the state Attorney General's Office, which chose not pursue criminal charges against Miller and Ybarra because it didn't believe the case would be successful.

The Goodyear Police Department has been in turmoil since the release of the independent investigation in March led to the departure of its top two commanders and sparked additional reviews of department management, policies and procedures.