The Springfield Police Department is disciplining one supervisor and three patrol officers after an internal investigation into a September crash with retired police sergeant Michael Egan.

The crash involved a vehicle Egan was driving and a motorcycle with two passengers. Those two passengers were seriously injured.

During a months-long internal investigation, SPD reviewed the actions of the on-duty officers and found that they had violated police rules.

Sergeant Zander, a supervisor, was suspended for six days for violating police rules and failure to supervise.

And three officers, Yanor, Wheeley, and Singletary were issued written reprimands.

SPD assembled and reviewed body camera footage and citizen video.

Their investigation included citizen interviews of the individuals present during the incident, a timeline, and police reports from the incident.

SPD said that because of complaints in the aftermath of the crash, the SPD launched an internal affairs investigation and brought in DUI experts to review the incident.

Egan was arrested and charged for aggravated driving under the influence causing great bodily harm. He was arraigned on one count of driving under the influence, and could face 12 years in prison.

The SPD brought in DUI expert Officer Larry Brooks, currently assigned with Macon County, to aid in the investigation.

Brooks looked into both how the officers handled the situation and concerns from the public about the handling of the case.

According to the report, while there were concerns that Egan was given water on scene, Brooks said it would not have impacted Egan’s BAC level in either a breathalyzer test or a blood draw.

Egan refused a breathalyzer at the scene, but bloodwork later showed he was intoxicated.

There were also questions about why Egan was not immediately detained after he was suspected of being under the influence.

The timeline of the investigation, which was released by SPD, said bystanders told responding officers they thought Egan was under the influence.

And Brooks said it's not common practice to immediately detain a person suspected for DUI.

He noted the pros and cons of immediate detainment...and that getting the suspected dui driver to walk around helps to gather more evidence of impairment.

And in reports written by the responding officers...

Officer Richard Singletary, one of the disciplined officers, wrote in police reports that he did not notice an odor consistent with alcoholic beverages on Egan.

He did note that Egan kept placing his hand on a vehicle to regain balance.

Six officers, including two supervisors, were dispatched to the scene.

All four SPD personnel are ordered to complete retraining.