Update: 11:30 a.m. July 23, 2018

MILWAUKEE (CBS 58) -- The Milwaukee Police Department confirms that an off-duty member of the Milwaukee Police Department was the driver who lost control, crashing into a tree and killing the passenger.

The off-duty member of the police department is currently on administrative leave.

The investigation remains ongoing. 

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Update: 5:11 a.m. July 23, 2018

MILWAUKEE (CBS 58) -- Milwaukee Police continue their investigation into a fatal accident that happened around 6:18 p.m. on Sunday.

According to police, a vehicle which was occupied by two adult males lost control and struck a tree near 53rd and Howard.

The 79-year-old male passenger died at the scene. The Milwaukee Fire Department confirms that he was a former firefighter. 

The 31-year-old male driver is cooperating with the investigation.

The accident remains under investigation.

Stay with CBS 58 News for more information on this developing story.

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MILWAUKEE (CBS 58) -- The Milwaukee County Medical Examiner has been called to a crash near 53rd and Howard Sunday evening. 

The incident was reported just before 7:30 p.m. 

Video from the scene shows that a car hit a tree. 

The arrival of the ME indicates that the crash is fatal.

Stay with CBS 58 for more on this developing story.