Authorities have identified a roofing worker was killed when a fire broke out as they worked on top of a River North parking garage Saturday afternoon, seriously injuring four others, according to the Chicago Fire Department.

Terrell Webster, a 47-year-old construction worker, was found dead at the scene, according to fire officials and the Cook County Medical Examiner’s Office. A ruling on the cause and manner of his death was pending further investigation following an autopsy Monday.

The blaze started about 1:20 p.m. in the penthouse elevator area of the Mart Parc Orleans garage at 437 N. Orleans St., fire officials said.

One worker was able to escape the penthouse by the time firefighters arrived a few minutes later, and he directed them to the other workers still inside, according to CFD Battalion Chief Cynthia Herring.

Four were rescued and taken to hospitals, all in serious or critical condition. They were all working for a roofing contractor at the time, making preparations from the inside of the structure for winter, Herring said. No one else was hurt.

It took about 15 minutes to put out the flames, Herring said.

Grid View First responders at the scene of a fatal fire at a parking structure on Orleans and Hubbard, Saturday, Dec. 29, 2018, in Chicago. | Tyler LaRiviere/Sun-Times

First responders at the scene of a fatal fire at a parking structure on Orleans and Hubbard, Saturday, Dec. 29, 2018, in Chicago. | Tyler LaRiviere/Sun-Times

Chicago Fire Fighters point up to the top of the parking structure where official say where the fire originated, Saturday, Dec. 21, 2018, in Chicago. | Tyler LaRivere/Sun-Times

First responders at the scene of a fatal fire at a parking structure on Orleans and Hubbard, Saturday, Dec. 29, 2018, in Chicago. | Tyler LaRiviere/Sun-Times

First responders at the scene of a fatal fire at a parking structure on Orleans and Hubbard, Saturday, Dec. 29, 2018, in Chicago. | Tyler LaRiviere/Sun-Times

First responders at the scene of a fatal fire at a parking structure on Orleans and Hubbard, Saturday, Dec. 29, 2018, in Chicago. | Tyler LaRiviere/Sun-Times

Representatives for the company that manages the garage did not return messages seeking comment.

Dozens of emergency vehicles crowded the busy downtown neighborhood as firefighters secured the scene.

The roof of the structure on top of the 10-story garage was charred after crews put out the fire. Videos shared on social media showed plumes of think, black smoke billowing out earlier.

The garage remained closed to drivers for several hours following the fire. The cause is under investigation.