Two Iowa teenagers pleaded guilty to first-degree murder Tuesday in the deadly beating of their high school Spanish teacher. 

Willard Miller, 17, and Jeremy Goodale, 18, both changed their pleas to guilty, admitting they helped kill 66-year-old Nohema Graber, their Spanish teacher at Fairfield High School, in November 2021. Prosecutors say the beating ensued following a meeting Miller had with her over a poor grade he received in her class. 

Miller and Goodale, who were both 16 at the time of the killing, are accused of ambushing Graber in Chautauqua Park, where she was known to take daily walks. 

They then dragged her into the woods and beat her to death with a baseball bat, court papers allege. Prosecutors say evidence shows both teens struck Graber with the bat. However, Miller has denied ever hitting Garber, despite admitting he helped plan and carry out the killing. 

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Goodale testified that Miller initiated the plan to kill Graber, and they both struck her.

Witnesses saw Graber's van leaving the park less than an hour later with two males in the front seat.

Her body was found the next day hidden under a tarp, a wheelbarrow and railroad ties, documents say.

Graber's van was left at the end of a rural road. Investigators say Goodale and Miller were later picked up by a witness after receiving a call from Goodale. 

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A police interview shows Miller's frustration with Graber's teaching, with Miller saying his grade in her class would lower his GPA. 

Prosecutors have agreed to recommend a sentence between 30 years and life in prison with the possibility of parole as part of an agreement with Miller and a sentence between 25 years and life with the possibility of parole for Goodale.

Goodale agreed in late March to testify against Miller during his trial, which is set to start later this week. 

Both teens will be charged as adults due to the severity of the crime. They were not subject to a mandatory life sentence without parole due to their ages when the crime was committed.

Fox News' Rebecca Rosenberg and the Associated Press contributed to this report. 

Billy Gardell showed off his jaw-dropping slimmed down figure after his dramatic weight loss journey.

The 53-year-old actor – who weighed 370 pounds during the peak of his television sitcom "Mike & Molly" – detailed his shocking transformation.

"I float between 205 and 210 [pounds]," Gardell said of his current weight during an appearance on "Entertainment Tonight."

"Self-care is important, and I think I finally got there… Walking around pretty healthy these days."

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Gardell continued to offer advice for those looking to lose weight.

"I think you got to find peace with yourself and at some point, look in the mirror and go, 'You know, it's probably time to take care of you.' And I didn't get that note early on," he expressed.

"But I'm a big believer that when you get it, you get it. It doesn't matter what it is, as long as you get it."

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In 2020, the "Bob Hearts Abishola" star underwent a life-changing procedure: gastric bypass surgery.

"I chickened out from doing it like twice," he added.

Since his impressive weight loss, Gardell pointed out that his resting heart rate dropped from 113 to 68 and that his Type 2 diabetes is now "gone."

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While he switched to healthier life choices, including incorporating "small but very healthy" meals into his diet, he confessed there’s one habit he’s still attempting to quit.

"I'm still smoking cigarettes," Gardell admitted. "But I'm working on that one. A buddy of mine told me, 'Knock them down in the order they're killing you.'"

The father of one explained that his son was his biggest motivation to shed weight.

"When you hit 50, you start doing that dad math, like, 'If I can live 25 more years, and he'll be 40'... You know what I mean?... I want to be here for him," he remarked.

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"I've been an example in a lot of good ways for my child, but I feel like I wasn't a good example of health for him… I want him to see that. It doesn't matter what age you are, if you are willing to do something a day at a time, you can change anything."

The "Young Sheldon" star went on to say that he had to tape back his skin while filming because his "skin hadn’t adjusted yet" after the weight loss.

One critique that Gardell has about being skinny is that his wardrobe drastically changed. 

"I miss my fat boy pants because you could drop them and step out like a fireman," he quipped.