Austin Fire Chief Dan Wilson, after a career of nearly 26 years, has announced his retirement, with his last day to be Dec. 31.

“It’s just time,” Wilson said.

The chief turns 53 Dec. 10 and said that although he made up his mind to retire in July, he just told the city last week.

City officials recently confirmed that Wilson is the subject of an internal investigation. City officials have not confirmed the nature of the investigation, though multiple documents cite alleged unfavorable working conditions at the station.

Wilson maintains that he has not created such an environment and is the victim of an attempt to have him ousted at any cost.

He also said his decision to retire had nothing to do with the investigation.

The retirement will end a controversial year for Wilson.

In February, local business owner Carla McCarthy claimed that the chief verbally attacked her during a fire committee meeting.

In April, the Austin City Council and the City of Austin made public a letter of warning and reprimand to Wilson stemming from his conduct during that meeting.

He was not placed on leave.