Law enforcement officials have identified both the shooter and the victims in Thursday's deadly shooting at ProTec, a Sioux Steel location in Lennox.

According to Lincoln County Sheriff Dennis Johnson, the suspected shooter in the incident is 52-year-old Jeffrey Dezeeuw of Sioux Falls.

Dezeeuw allegedly entered Sioux Steel around 9:30 a.m. Thursday and got into an argument with John Richter, 45, of Lennox. Lennox Police Chief Orville Jorgenson says Dezeeuw was attached to Sioux Steel, though he was not sure if he was an employee of the company, or if he worked as a contractor.

After the argument, Dezeeuw left the building, then came back in shortly afterwards. Johnson says that's when Dezeeuw opened fire, shooting and killing Richter.

Dezeeuw then allegedly shot Kathy Steever, 46 of Lennox, in the head. Steever was hospitalized for her injuries. She was originally in critical condition, but Johnson said on Friday that her condition has improved.

The third victim, Brian Roesler, 45, of Marion, was in a different part of the building at the time of the fight. When he heard shots, he went to see what was going on. When he found Dezeeuw, the two became engaged in a physical altercation.

Roesler was hospitalized as a result of that fight, but has since been released. Johnson says Dezeeuw left the scene after the fight.

All three victims were employees of Sioux Steel. Johnson says Roesler's actions may have saved the lives of others at the scene.

Johnson says Dezeeuw drove south of Lennox a few miles in a truck. At this point, investigators believe Dezeeuw lit the truck on fire before shooting himself.

Some employees at Sioux Steel back at work today, though the area where the shooting happened was blocked off.

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Lennox, SD (ABC9 News) - A fatal workplace shooting in the town of Lennox has shaken residents who say the community is typically a quiet place.

A man killed one person and injured two others in a shooting incident Thursday at a Sioux Steel Company location known as ProTec. The suspected gunman is believed to be a man found dead inside a burned semi-trailer south of the town that's about 20 miles southwest of Sioux Falls. Authorities have not identified anyone involved.

Lincoln County Sheriff Dennis Johnson says that an autopsy was being done Friday.

The Sioux Steel location in Lennox will remain closed until further notice, according to the company's phone message service.

An officer with the Lennox Police Department issued a statement on the department's Facebook early Friday morning, stating the following:

"Tonight as I try to put together an afternoon of tragedy mixed with heroism and total cooperation between first responders, the Lennox Police Dept. owes it's appreciation to the Lennox Ambulance Service, The Lennox Fire Dept., the Lincoln County Sheriffs Dept., Tea Police Dept., the State Division of Criminal Investigation (DCI) and the South Dakota Highway Patrol as well as the Lennox School District. All the above and a so far unnamed individual brought this incident to what professionals in our business would say was the best possible resolution to a senseless, horrifying incident. Our heartfelt thanks goes out to all those involved."

Sioux Steel owner Scott Rysdon calls the incident a senseless tragedy. Mayor Orville Wiebers says that nothing like it has ever happened in the town of about 2,200 people.

Lincoln County State's Attorney Tom Wollman says it's going to take a lot for the community to recover.