'Queen of Versailles' Jackie Siegel Has Not Returned to Mansion Since Daughter's Overdose Death

In an exclusive interview with INSIDE EDITION, the Siegels described the pain of losing their 18-year-old daughter, Victoria.

Queen of Versailles stars Jackie and David Siegel are speaking out in their first interview since their daughter's overdose death.

In an exclusive interview with INSIDE EDITION, which will air in full on Thursday, the couple revealed they have not stepped foot in their famous mansion since their 18-year-old daughter Victoria passed away on June 10.

On Wednesday, the medical examiner's office announced that her death was an accident caused by "acute mathadone and sertraline toxicity." Methadone is a prescription painkiller that's sometimes used to treat drug addiction while Sertraline treats depression.

"As a mother, I can say it's the most horrible thing that I have ever, ever experienced," Jackie told INSIDE EDITION's Les Trent. "Personally I have not stepped foot in the house since Victoria died."

Her husband added: "I haven't been back to the house. One of the bedrooms was going to be hers."

Read: 'Queen of Versailles' Jackie Siegel in Mourning After Daughter Dies of Possible Overdose

The Siegels rose to fame with a film about their lavish lifestyle. Despite the tragedy, the couple say construction is continuing at their Florida super-mansion, which is expected to be finished by 2017.

Speaking to INSIDE EDITION, Jackie also opened up about the criticism she faced for taking a photo at her daughter's funeral. She denied she was taking selfies, as reports suggested at the time.

"It’s my last moment ever to remember my daughter and that day," she said. "There’s no book that tells you what you should and shouldn’t do at a funeral."

She added: "I just love my baby so much, I just want every last moment to remember her by."

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In Victoria's memory, the Siegel family has set up a charity, the Victoria's Voice Foundation, to help save teens struggling with drug addiction.

David said: "We’re going to win this battle. We can’t save everybody but we’re going to make a dent.”

His wife added: “'To lose' isn't in his vocabulary.”

For the full interview, tune into INSIDE EDITION on Thursday.

Watch Below: 'Queen of Versailles' Jackie Siegel Breaks Silence After Daughter's Death