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Exclusive: Father Vows To Solve Mysterious Death Of Daughter In Miami Beach

MIAMI BEACH (CBS4)- A grieving, determined father said he will not rest until someone is held accountable for the death of his 21-year-old daughter, who died after toxic levels of the date rape drug "GHB" were found in her system.

Dan Sumnicht, of Green Bay, Wisconsin, told CBS4's Peter D'Oench that he's looking for justice in his daughter's death.

"There's a homicide here," he said. "Julia's life was taken from her. She had a tremendous future ahead of her. She lit up a room when she came in. She knew how to make people laugh when she came in. And there's just a big hole in our lives right now."

D'Oench caught up with Sumnicht as he was in  Miami for business-related meetings and on the day before he planned to meet with two Miami Beach police detectives on Friday morning.

"My daughter loved the Green Bay Packers and she dreamed of becoming a model," said Sumnicht. "She was a communications major at the University of Wisconsin-La Crosse when she went to South Beach for spring break last year."

Her dreams of becoming a model ended in March of 2010. A report from the Miami-Dade Medical Examiner's Office show high levels of the date rape drug in her system along with trace amounts of alcohol.

Sumnicht said he still doesn't have answers.

"We're very frustrated. It's been over 600 days. We still don't have any accountability for this," said Sumnicht. "There's a saying that goes that justice delayed is justice denied and that normally refers to defendants. What about the victim and who's going to be the advocate for the victim?"

While Miami Beach Police are not commenting because the case is an open investigation, Sumnicht has uncovered a lot of information through a private investigator who he has hired, Chris Catania.

Catania discovered that sometime on the day she died, Sumnicht met up with 36-year-old Zoltan Prepszent, a celebrity photographer, at a club in South Beach.

Catania said Sumnicht and Prepszent had actually met each other the year before.

"He admitted to being in the apartment with Julia and that he had consumed GHB himself knowing that Julia would not have taken the drug on her own and that Itzler had access to it," said Catania. "You know as an investigator you put two and two together and someone slipped Julia that drug."

Sumnicht took a picture of herself shortly before her death and it showed a dazed look on her face.

The Medical Examiner's Office found that she had high levels of the date rape drug in her system but only trace amounts of alcohol.

"It is my belief that while she was out at Club Set she was protecting herself, taking care of herself, you know having a good time. She was not consuming alcohol," said Catania.

D'Oench tried to reach Prepszent on his cell phone, but he did return a call. Jason Itzler, who is in a Manhattan jail, could not be reached for comment. In a jailhouse interview with The New York Post in September, Itzler said he "almost died that night" from ingesting too much GHB himself.

So far, no one has been charged in Sumnicht's death.

"I feel like she's not a Jane Doe," said Dan Sumnicht. "She is Julia. She deserves answers. It's been painfully slow getting answers. I think we are making progress."

"We want to say that it's time for people with information to come forward and that it's been too long and that we don't go away until we get accountability for this," said Sumnicht.

Sumnicht told D'Oench he will return to his family in Green Bay, Wisconsin on Saturday. His daughter Julia had three other, younger siblings. His wife, Marie, is an elementary school teacher.

"Zoltan was a photographer and a club promoter in the Miami Beach area," said Catania. "He was a Papparazzi kind of guy."

Prebszent shared a condo with 44-year-old Itzler. Itzler, who calls himself "The King of All Pimps," is currently in New York facing charges of promoting prostitution and selling drugs.

According to The New York Post, Itzler placed himself at the condo with the couple.

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