Haunting cause of death of mom and twins revealed after their decomposing bodies mysteriously discovered in car

A MOM killed her two young twins before taking her own life, a coroner has ruled.

Mystery had surrounded the deaths of Andrea Langhorst, 35, and her two kids, aged three, after they were found dead in their car in Melbourne, Florida earlier this year. 

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But an autopsy released this week and obtained by confirmed that Langhorst gave Olivia and Adam Dryer a fatal overdose of drugs.

Their deaths have been ruled homicides.

Langhorst then committed suicide after taking meth and cocaine, an autopsy report by Brevard County ruled.

Police had been called to investigate reports of a suspicious vehicle when they discovered the tragedy on March 20.

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Andrea's dad Randy Langhorst had said at the time that he believes that drugs may have been a factor in his daughter's death.

Authorities had also confirmed that Langhorst and her kids lived out of their vehicle from time to time and were living in the Cadillac at the time of their deaths.

Langhorst's father also said that she had been living in AirBnbs to stay off the radar while the three-year-olds' father is in prison.

Randy told  that his family was devastated to hear the news.

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He hadn't spoken with his daughter since March 11, which was unusual. He had already filed a missing person report with the Florida police.

"We were looking for her and hadn't heard anything from her. That was unusual for her," he said.

"We wouldn't have daily contact with her, but this was a while. She was a free spirit, smart as a whip, beautiful, but lived her life to the beat of her own drummer. It's just a tragedy."

Andrea had been arrested on drug charges in the past and had spent time in drug court.

She spent 25 days in jail in 2010 for oxycodone possession.

Randy told Florida Today that his daughter had been in good spirits before her death, and he didn't have reason to be concerned for her welfare or the welfare of his grandkids.

The twin's father was awaiting trial on charges unrelated to Andrea and her children at the time of their deaths.

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"The twins were her pride and joy," Randy added.

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"All I can think is that maybe...maybe the car was running and she fell asleep, maybe the fumes overwhelmed them. I don't know," he said. 

If you or someone you know is affected by any of the issues raised in this story, call the National Suicide Prevention Lifeline at 800-273-TALK (8255) or text Crisis Text Line at 741741.