One of the two people who died following multiple explosions at the U.S. Steel Clairton plant on Monday has been identified as Timothy Quinn, the victim's family told KDKA. 

The sister of Quinn confirmed to KDKA that he died on Monday. The Fitz Henry native was 39 years old. Fitz Henry is a neighborhood in Smithton, Westmoreland County.

Those who knew Quinn are remembering him as a great guy and a hard worker. He had worked in the plant for more than 15 years. His latest job title was heater. 

"Tim was a good dude," friend and coworker David Wheatley said. "He would give you the shirt off his back. ... He was just one hell of a dude. I can't really explain it more than that. He's probably one of the best coworkers I've ever had."

"Every time I've seen him in the parking lot, no matter what it was, he always smiled," he added.

Quinn had a girlfriend and was a father of three. His father also had worked at the mill. 

"He loved his family," Wheatley said. "He talked about his kids all the time."

An initial explosion happened at U.S. Steel Clairton Coke Works just before 11 a.m. on Monday, followed by multiple reported secondary explosions, Allegheny County said in a news release. Quinn and another person were killed, and at least 10 people were injured. The second victim has not been identified as of Monday night. 

The explosions occurred inside the reversing room for batteries 13 and 14, sources told KDKA. The room acts as a mechanical regulator, making sure the coal bakes evenly in the oven.

Authorities are investigating the explosions. No cause was determined immediately. 

"There are so many things that will never be answered, but hopefully they are answered," Wheatley said. "It just could be a freak accident."