ORLANDO, Fla. -- The office building where a man shot six former co-workers re-opened Monday and police are starting to build their case against confessed killer, 40-year-old Jason Rodriguez. Witness accounts are starting to give Eyewitness News an idea of exactly what happened on the eighth floor of the Gateway Center Friday morning.

Jason Rodriguez is in jail facing first-degree murder charges, but police say he may face more. They believe they have the gun he used to shoot six people. One person was killed in the shooting and the other five are expected to survive. Four victims remain hospitalized.

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SURVEILLANCE: Images In Building Capture Killer
TEAM COVERAGE: Case Being Built, Surveillance Released
NEWS BRIEF: Monday Morning Update On Shooting

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The office building reopened Monday, but the business where the shooting happened did not. An eyewitness said the eighth floor looked like a war zone after Friday morning's deadly rampage.

There was blood, broken glass and bullet casings everywhere. It's all being cleaned up and investigators are still trying to figure out what set Jason Rodriguez off before he opened fire and where he went immediately after he left the building.

Surveillance cameras in the Gateway Center office building captured two photos of confessed killer Jason Rodriguez (see images). Orlando police say it appears he was wearing two different outfits Friday morning. In one, he appears to be wearing a hat and some kind of a vest. In the other photo, he does not.

Investigators say Rodriguez walked right into the eighth floor office of Reynolds, Smith and Hills (RS&H), Incorporated engineering firm (visit their website) where he used to work and immediately fired at least two shots at RS&H employee Otis Beckford, who was standing next to the receptionist's desk.

Rodriguez left him there to die and then walked to a common work area at the office and opened fire again. One worker said they hid under a desk, saw bullets hitting the floor and watched Rodriguez's feet walk past them. An eyewitness said there was shattered glass from cubicles and computers all over the floor.

“The first-degree murder charge is just the beginning. We still have other victims we're going to be talking to once their medical needs are completed,” Orlando Police Chief Val Demings said.

Rodriguez told police that RS&H forced him out for no reason and prevented him from getting unemployment benefits. He also said he had a tough time finding work after he left the company.

However, Eyewitness News learned that Rodriguez had at least two jobs since then and RS&H says it allowed him to resign rather than firing him over long-time performance issues so that he would be able to apply for unemployment benefits.

“It's not true. We could have taken different action. Instead, we worked with Mr. Rodriguez to make sure he was allowed the opportunity to voluntarily resign and be eligible for unemployment income. This was two and a half years ago. He had employment afterward elsewhere we did everything we could,” RS&H Vice President Jim Avitabile said.

Eyewitness News learned Monday, that Rodriguez confronted another former employer weeks ago and police were called to the scene. Orlando police investigated him in September for ramming a wall at a Subway restaurant where he once worked.

He went to Dipasqua Enterprises, which runs the Subway restaurant that fired him. He demanded to see the president and stormed off when he was turned away. He then caused the disturbance at the restaurant.

Orange county records show Rodriguez walked off his civil engineering job last year.

His resume never mentions his 2007 job at RS&H. The 2008 employer he lists can't be found with his contact information.

Another former employer told Eyewitness News Monday Rodriguez was let go because of his frequent absences.

DETAILED ACCOUNTS RELEASED IN ORLANDO SHOOTING

A man who was in an Orlando office when a former employee came in and started shooting said Monday that the ordeal that left one dead and five injured lasted about a minute.

Mark Davidson, a vice president at the engineering firm Reynolds, Smith and Hills, said Monday that his co-workers stayed calm Friday and didn't scream as Jason Rodriguez entered a reception area of the eighth-floor office and began shooting randomly.

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VIDEO REPORT: Eyewitness Describes Shooting Scene

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"Nobody was screaming or yelling," Davidson said. "It wasn't panicky."

The gunman pulled a pistol from a holster under his shirt in the reception area of the U-shaped office and began shooting. At first, Davidson said he didn't know what the noise was. He thought it might be balloons popping or book shelves falling over. There is only one main entrance to the office from outside, and it was typically unlocked during business hours.

The building had security guards posted at a desk on the first floor, but visitors could come and go with relative ease before Friday's shooting.

The noises kept getting closer and Davidson saw other people running, and he knew something was wrong.

Davidson ran to back of the office where other workers had gathered and they waited a moment, trying to piece together what was happening. They then saw the gunman from about 25 yards away as he had made his way about three-quarters through the U-shaped office. They fled.

"You're seeing the shooter and you put two and two together," Davidson said. "You knew we were, as a company, victims of a senseless crime."

Rodriguez has been charged with first-degree murder, and Orlando Police Chief Val Demings said Monday that more charges are expected. The shooting caused havoc in downtown Orlando as authorities scrambled to find Rodriguez, who was eventually tracked to his mother's home. He surrendered peacefully, but later remarked to reporters that he went on the rampage because his former co-workers "left me to rot."

An attorney for Rodriguez has portrayed the 40-year-old as a mentally ill man who fell victim to countless personal and financial problems. Rodriguez left his engineering job at the firm two years ago and hadn't been able to find comparable employment since then. He most recently made less than $30,000 a year at a Subway sandwich shop.

"There were performance issues over time and there had been reviews we had with Mr. Rodriguez trying to correct the situation and trying to direct him to another level," said Lerrie Jenkins, chairman and CEO of the firm. "It just didn't work out so we agreed mutually for him to leave the company and he signed a letter of resignation."

After his arrest Friday, Rodriguez told detectives that he blamed the firm for hindering his efforts to get unemployment benefits. Company officials were perplexed at that explanation given that he had worked elsewhere since leaving the firm.

"We worked with Mr. Rodriguez so that he was allowed the opportunity to voluntarily resign and be eligible for unemployment income," said Jim Avitabile, a vice president at the firm. "This was not an abrupt termination."

Otis Beckford, 26, was the lone fatality in the shooting. One of the shooting victims, Ferrell Hickson, was released from the hospital late Sunday. The other four victims remained hospitalized in stable condition.

WORKERS RETURN TO BUILDING TERRORIZED BY GUNMAN

The Gateway Center may be open again, but it's certainly not business as usual. The eighth floor remains closed and extra security guards are now patrolling the downtown building.

Security guards removed the crime tape around the Gateway Center before sunrise Monday morning, but the eighth floor is still closed because it remains a crime scene.

The normally secured 16-story office building was left open for employees Monday morning, but Orlando police officers were outside in the lobby and there was more private security.

“This could've happened anywhere, anyplace and really this is the most secure building in Orlando right now, so I’m feeling pretty good about coming back here,” Gateway Center employee Yvette Bohannon said.

Bohannon was off Friday, but Cynthia Reece was working on the first floor when Jason Rodriguez walked in and started shooting people at random. Monday morning, she recalled how she peaked out the window and saw officers motioning employees to get out.

“We weren't sure if they were saying, ‘Get away from the window’ or ‘come outside,’” Reece said.

The majority of workers seemed visibly uncomfortable. An expert said it's normal for them to feel depressed, anxious and confused.

”Normal day, that's really the only way to make it normal, is just to go through as a normal day,” Gateway Center employee Scot Flower said.

Police will have an officer keep watch on the building during regular patrols, but the building’s owner will pay for the off-duty officer in the lobby.

The CEO of RS&H, Leerie Jenkins, couldn't say how long that will last.

“We're going to be working with the landlord concerning that,” Jenkins said.

Jenkins said during a morning news conference, the families of RS&H employees are asking for privacy (watch full news briefing). He said he was encouraged by reports from the hospital regarding victims recovering and said the company was sticking by them through the entire healing process.

Jenkins did say his offices on the eighth floor could reopen by mid-week.