Brandon Colvin Jr lights a candle for his father, who was found dead in a collapsed apartment building in Iowa (Picture: AP / GETTY)

The body of a missing man was found in the ruins of an apartment building in Iowa, six days after it dramatically collapsed.

Brandon Colvin Sr was found dead on Saturday, city officials in Davenport, Iowa confirmed on Sunday.

Colvin, 42, was one of three men unaccounted for after an apartment building collapsed on Sunday, May 28. The other missing residents were identified as Ryan Hitchcock, 51, and Daniel Prien, 60.

The victim’s son, Brandon Colvin Jr, graduated from Rock Island High School on Saturday, the Quad-City Times reported. He had been sleeping at the site with other family members as they helped search for his missing father.

At least three residents of the collapsed building were reported missing: Branden Colvin Sr (left), Ryan Hitchcock (center), and Daniel Prien (right) (Picture: AP)

The six-story, 84-unit apartment building was located in downtown Davenport, just two blocks from the city’s waterfront on the Mississippi River. It was built in 1907 and was on the National Registry of Historic Places.

Seven people were rescued immediately after the collapse, while another 12 were escorted out by firefighters. Two more survivors were found the next day.

Officials initially said they did not believe any more people were stranded in the building, but this changed as family members began reporting their relatives missing.

The Davenport apartment building was originally built to house the Davenport Hotel in 1907 (Picture: AP)

Search and rescue crews have been slowly combing through the rubble due to the building’s poor structural integrity (Picture: AP)

A total of nine people were rescued alive from the building, including two who survived for over 24 hours in the rubble (Picture: AP)

Now, officials believe Hitchcock and Prien both had a ‘high probability of being home at the time of the collapse.’

The search for survivors has dragged on for over a week, as search and rescue teams have been forced to move slowly and carefully while sifting through the rubble.

‘The building is structurally unsound, is posing a risk to responders,’ Davenport Fire Chief Michael Carlsten said. ‘This is going to be a long and lengthy process.’

The building had been inspected multiple times over the last few years after residents placed complaints about water leaks and cracks in the walls. Parts of its façade and walls were actively being repaired when it collapsed.

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Brandon Colvin Sr was found dead the same day his son, Brandon Colvin Jr, graduated from high school.