A man who was pulled from a submerged van on Thursday evening, Sept. 19, was pronounced dead, Harris County Sheriff Ed Gonzalez said on his Twitter account. 

The victim, believed to be 40 to 50 years old, was unconscious when first responders pulled him out. Emergency crews did their best to rescue him and he was then transported to a local hospital in critical condition. But he later died, according to KHOU 11 News.

“The water level was about 8 feet high. The driver paused briefly, then accelerated into the water, causing his van to go under,” Sheriff Ed Gonzalez tweeted.

According to a witness, the man was underwater for about 20 minutes. 

No other occupants were found in the van.

This is the first death related to Tropical Depression Imelda in the Houston area. On Thursday alone, Harris County responded to more than 350 high-water rescues.