Diane Staudte, who was found guilty of poisoning her husband and children, maintains her innocence. Find out what she says in the ABC interview.

Diane Staudte, Mark Staudte's wife, murdered him in 2012. Following a tip from the family's pastor, Diane Staudte admitted to poisoning her husband and son Shaun.

She admitted to poisoning her family members by putting antifreeze in their Coca-Cola and husband's Gatorade, according to interrogation audio acquired by ABC News.

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Mark Staudte Wikipedia- Diane Staudte Husband Murdered

Mark Staudte died of what looked to be natural causes; however, some blamed his death on his unhealthy lifestyle.

His bandmates noticed he was acting weird, saying he was slurring his words, and his complexion appeared yellow. According to police accounts, there was a ring of blood around his mouth at the time of his death.

Five months after Mark's death, tragedy struck again when Shaun Staudte, Staudte's son, died of flu-like symptoms.

According to his postmortem report, a ring of blood was observed around his mouth, although his death was caused by past medical concerns, including a seizure disorder.

When Mark Staudte abruptly becomes ill and dies, it leaves his friends and family with unanswered questions. But, when other family members display similar symptoms, doctors must solve the mystery before it’s too late. Something’s Killing Me with @BD_Wong, Sunday at 8p ET/PT.

The Staudte Family Murders Story Explored By ABC

Diane Staudte claims she is innocent despite confessing to authorities that she poisoned her husband, son, and daughter with antifreeze.

In an exclusive interview with "20/20," Staudte said, "She said what she was taught to say; she's suggesting there's more to that than what people know." There is no proof that anyone other than Diane Staudte and her daughter, Rachel, was responsible for these heinous atrocities despite her denials.

Diane Staudte said she's ready to reveal the line of events that led to her life without parole nearly six years after pleading guilty to two charges of first-degree murder.

"Tiny professors," Staudte said of her children, "who all had their little special interests, but boy did they know everything about them."

Sarah Staudte, Diane Staudte's eldest daughter, was rushed to the hospital by her mother and sister Rachel Staudte.

Sarah Staudte was taken to the ICU with a brain bleed and organ failure. Doctors began to suspect poisoning while she was in the hospital.

Simultaneously, samples from Shaun Staudte's autopsy were collected, and testing revealed the presence of ethylene glycol, one of the antifreeze's essential components.

Sippy stated he tipped the Springfield Police Department after Sarah Staudte was hospitalized.

Because ethylene glycol is not a common element of standard toxicological screens and requires special testing to identify, it was overlooked at the initial autopsy.

According to interrogation audio acquired exclusively by ABC News, Diane Staudte admits to poisoning her family by putting antifreeze in her children's Coca-Cola and husband's Gatorade.

McAmis questioned her about why she didn't bring her spouse to the hospital during the interview.

She despised his guts, and I suppose she'd had enough, Staudte told detectives.

When musician Mark Staudte became ill and died, it left his friends and family with unanswered questions. Then, his son and daughter got sick. You're won't believe what happened next. Something’s Killing Me with @BD_Wong, Sunday at 8p ET/PT on @HLNtv.