An Illinois coroner's office is holding autopsies today for an elderly couple crushed to death after the wife drove their car through the fourth floor wall of a parking lot.

Iristeen Hunt, 70, and her husband Charles Hunt, 73, of University Park, Illinois, were killed after their car fell from the Market Square Center Garage in Indianapolis, Indiana on Wednesday.

Now authorities are hoping the autopsies, which will be conducted later today, can shed like on what led up to the fatal crash.

It is not yet clear whether Iristeen suffered a medical emergency, or if drugs or alcohol were a factor in the crash.

Meanwhile, friends and family are remembering Iristeen and Charles, a retired Chicago Transit Authority Employee and a Vietnam War veteran.

73-year-old Charles (left) and 70-year-old Iristeen (right) were visiting a sick relative in Indianapolis, Indiana

Indianapolis Fire Department personnel work the scene where a vehicle plummeted from an upper level of a parking garage in Indianapolis, Wednesday

Pictured: An aerial view of the crashed SUV after it fell four stories after Iristeen drove through the parking garage wall

CBS 2 reports that the couple spent much of their time at the local Veterans of Foreign Wars group in University Park.

The Hunt's friends gathered at VFW Post 311 to reminisce over good memories and mourn the lose of their close companions.

Willie Goodson, VFW house hall manager, was good friends with the couple.

'Just shock, just shock – the way it happened and how it happened,' he said. 'Charles was the fun guy.'

Pictured: A graphic showing the fourth floor parking garage wall where the Hunt's crashed through and the scary height the SUV fell

Larry Woolridge was in Vietnam with Charles and says Charles was 'a well-known character.'

'That really hit me right then – what happened? Why did the car go off the parking lot? What happened? Did the accelerator stop or hang up or what,' he said.

The Hunts were in Indianapolis visiting a sick relative and as of Thursday night the authorities have not uncovered the reasons surrounding the crash.

However, it is being classified as accidental.

Woolrdige said: 'I lost a buddy. A fishing buddy.'

Charles (left) and Iristeen Hunt (right) were killed after she plowed their car into the wall of a parking garage Wednesday

Charles (left) is a Vietnam War veteran and the couple spent much of their time at the Veterans of Foreign Wars Post 311 group in University Park

One woman who appeared to know the Hunts through VFW and said she saw them recently mourned on Twitter.

'This Is Sad Friends of Our VFW POST 311 FAMILY...KEEP EVERYONE LIFTED IN PRAYER THIS IS TRAGIC,' she tweeted.

Police say their car plowed through the wall at just before 10am, tumbling four floors before landing on its roof in an alley behind the City Market.

The couple died at the scene and a man who witnessed the plunge was treated for shock.

Fire Department Battalion Chief Rita Reith said the woman was driving. It is not yet clear what led to the fatal crash.

'There was very little that the extrication teams could do,' she told reporters.

Fire Department Battalion Chief Rita Reith said the woman was driving when she crashed through the wall (pictured is the gaping hole left by the car)

Reith said there are many unanswered questions that will have to be unearthed during the investigation.

'Hitting the gas instead of the brake, a medical condition, any number of things could have happened.'

Scene photos show that their car roof was almost completely caved in after the fall.

A gaping opening is seen on the side of the parking garage where the SUV broke through the concrete safety barrier.

Indianapolis Fire Department officials works the scene where a vehicle plummeted from an upper level of a parking garage, Wednesday landing inverted in the alley behind the City Market, in Indianapolis

Several people were walking the streets when the SUV came to a horrifying crash.

Market Square Center is home to several shops, bakeries and businesses that attract a mass of people daily. There was reportedly an influx of people on Wednesday because there was a nearby farmers market.

Witnesses describe hearing a loud, booming sound when the car met the concrete floor.

Eyewitness Robby Hancock works at a barbershop nearby the garage and saw the moments after Hunt drove through the wall.

'[I] heard a crash, heard a boom. Then I kind of flinched, looked up and back and seen the concrete coming and the car coming behind it,' he told Courier Journal.

Two fatalities were found in the vehicle. The incident is now under a death investigation

The couple died at the scene and a man who witnessed the plunge was treated for shock

Indianapolis Fire Department personnel work the scene where a vehicle plummeted from an upper level of a parking garage

'The car just kind of came out, flipped over and came straight down and just crashed.'

Bonnie Judkins had just bought some tea at the City Market when the vehicle crashed about 20 feet away from her.

'I looked over, and I saw the big concrete wall come flying down. Then about two seconds later a car coming face forward out. It just flipped and landed on the top.'

'It sounded like a bomb went off.'

A gaping opening is seen in a parking garage where a vehicle plummeted from an upper level, Wednesday