Warning: The videos show some startling images.

Surveillance video obtained by the News-Leader shows how a nearly 2,000-foot-tall TV tower in Fordland collapsed during a maintenance operation.

The KOZK tower collapsed on April 19 while workers were replacing diagonal braces.

Steve Lemay, the crew's 56-year-old foreman, was killed as the tower went down. The other workers escaped without serious injuries.

Missouri State University, which owns the tower, released the surveillance video to the News-Leader on Monday after the Occupational Health and Safety Administration completed its investigation of the tower collapse.

Surveillance videos from several cameras on the property show men descending from the tower and then running before the structure comes crashing down in a cloud of dust.

The goal of the tower work was to make the structure stronger by replacing diagonal braces so the tower could accommodate the added weight of a new antenna.

The OSHA investigation found the procedure the workers used was flawed.

Their report says the workers removed bolts where the diagonal members met the horizontal braces. Removing those bolts weakened the structure and it went down, according to the report.

The report also says Lemay used a turnbuckle with a rated working load of 8,000 pounds while replacing the diagonals, instead of the recommended 20,000-pound capacity turnbuckle. The turnbuckle is a device used to adjust the tension of steel cables used during the diagonal replacement.

RELATED:What we know about the Fordland TV tower collapse

Scott Allen, spokesman for OSHA, said no citations would be issued to Steve Lemay LLC, the company that performed the work, since the business dissolved after the tower collapse. There were also no citations issued to TCI Tower Consultants Inc., which was contracted for the overall project.

April 19, the day the tower collapsed, was the first day Lemay's crew began working on the structure — after spending two days preparing the materials and another day waiting out the high winds.

The report says the crew completed the diagonal replacement on two of the three sides at 105 feet off the ground and started work on the third when they began hearing strange sounds above them.

When the tower started making noise and showed signs of being unstable, the report says Lemay told his employees to get down while he stayed on to see if he could find the problem and fix it.

It wasn't long before the tower came down, and Lemay was "struck and killed by the falling structure," the report says.

The report says the three other crew members were able to get off the structure before it fell.

A witness described the sound of the tower collapse as a "car crash magnified by 500."

Some sections of the tower became a twisted mess, while others remained fairly intact as they fell to the ground.

The guy wires disengaged from their anchor points and whipped about, slashing through tree limbs and fencing in the field where the tower stood.

OSHA engineers visited the site twice and reviewed photographic evidence, witness interviews, construction documents, industry standards and engineering reports during their investigation.

Missouri State University announced in July it had begun broadcasting Ozarks Public Television from the KY3 tower in Fordland.

President Clif Smart said at the time that officials were debating whether the university should rebuild its tower or lease space, as it is doing now.

Lemay was from Washington state. His son told the News-Leader that Lemay was the "picture perfect dad."

Lemay volunteered at an orphanage in India and opened his home to victims of domestic violence during the holidays.

A colleague said Lemay had worked on TV towers for more than 20 years and had a reputation for his professionalism.

The work at the KOZK tower was part of what has been dubbed the "repack," where hundreds of TV stations will be moving from one channel to another over the next two years.

An industry expert told the News-Leader in June he was worried the haste to complete this work would lead to more tragedies on TV towers across the country.

TCI Tower Consultants Inc. was the company contracted to provide various engineering and project management services for the KOZK tower repack. Steve Lemay LLC was contracted by MSU to perform the diagonal replacement work on the tower as specified by the TCI design.

Here are the official conclusions reached by OSHA after its investigation:

TCI's suggested diagonal replacement procedure was flawed in that it compromised the effectiveness of the integrated surrounding braces and the load bearing capacity of the tower legs. A single diagonal brace could not be removed without affecting the integrity of the redundant brace because the braces share two common bolts at the diagonal/redundant connection.

The cause of the communication tower collapse was the weakening of the compressive strength of the tower legs by removing the bolts at the connection of the diagonals to the horizontal redundant. The compromised redundant effectively doubled the unbraced length of the tower leg which reduced the compressive capacity of the tower leg.

Lemay used an undersized come-a-long while removing the diagonal braces.

Lemay failed to provide the design of the required temporary frame for diagonal replacement above or below a guy level. TCI failed to confirm the use/design of a temporary frame as TCI is required to approve the adequacy of the temporary frame prior to diagonal replacement according to TCI's construction documentation.

MORE FORDLAND TV TOWER COLLAPSE COVERAGE:

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