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Michelle Carter, 22, is now in state custody after a judge approved prosecutors' request to have her begin her jail sentence.
The Plainville, Massachusetts resident was sentenced to 15 months in jail for convincing Conrad Roy III to kill himself.
Carter's lawyers say they plan to take her case to the U.S. Supreme Court.
A Massachusetts woman who sent her suicidal boyfriend a barrage of text messages urging him to kill himself was jailed Monday on an involuntary manslaughter conviction nearly five years after he died in a truck filled with toxic gas.
Michelle Carter was sentenced to 15 months in jail in 2017 for her role in the death of Conrad Roy III, but the judge allowed her to remain free while she appealed. Massachusetts' highest court upheld her conviction last week, saying her actions caused Roy's death.
A lawyer for Carter had urged the judge to allow the 22-year-old to stay out of jail while they take her case to the U.S. Supreme Court. Her attorneys said in court documents that she has no prior criminal record, hasn't tried to flee, and has been receiving mental health treatment.
But after a judge ruled that she should start her sentence, Carter was taken into custody Monday. She was being held in the medical unit of the Bristol County House of Corrections overnight, and she is expected to be re-evaluated daily before being sent to general population.
Michelle Carter Begins Jail Sentence
Earlier in the day, Massachusetts' highest court denied an emergency motion filed by her lawyers to keep her out of jail.
"Today has been a long day coming," said Maryclare Flynn, Bristol County assistant district attorney.
"It's been 4-1/2 years since Conrad passed. Our heart has been broken this whole time," added Roy's aunt, Becky Maki, speaking on the family's behalf. "It's been hard to live out the details of his death over and over again. It's something that hasn't left our mind... I hope that no one else ever has to feel this pain. His life mattered. It mattered to us and I think it mattered to a lot of people. Conrad, we love you."
Carter's family had no comment after leaving court Monday.
Joe Cataldo, Carter's attorney, said afterward that the "legal fight is not over."
Carter was 17 when Roy, 18, took his own life in Fairhaven, a town on Massachusetts' south coast in July 2014. Her case garnered international attention and provided a disturbing look at teenage depression and suicide.
Family of Conrad Roy Speaks Out
Carter and Roy both struggled with depression, and Roy had previously tried to kill himself. Their relationship consisted mostly of texting and other electronic communications.
In dozens of text messages revealed during her sensational trial, Carter pushed Roy to end his life and chastised him when he hesitated. As Roy made excuses to put off his plans, her texts became more insistent.
"You keep pushing it off and say you'll do it but u never do. It's always gonna be that way if u don't take action," Carter texted him he on the day he died.
But the juvenile court judge focused his guilty verdict on the fact that Carter told Roy over the phone to get back in his truck when it was filling with carbon monoxide. The judge said Carter had a duty to call the police or Roy's family, but instead listened on the phone as he died.
"After she convinced him to get back into the carbon monoxide filled truck, she did absolutely nothing to help him: she did not call for help or tell him to get out of the truck as she listened to him choke and die," Supreme Judicial Court Justice Scott Kafker wrote in the court's opinion affirming her conviction.
At trial, Carter's lawyer argued Carter had initially tried to talk Roy out of suicide and encouraged him to get help. Her attorney said Roy was determined to kill himself and nothing Carter did could change that.
Judge Orders Michelle Carter into State Custody
Her appellate attorneys said there was no evidence that Roy would have lived if Carter had called for help. They also argued there wasn't enough evidence to prove that Carter told Roy to get back in his truck.
Her phone call with Roy wasn't recorded, but prosecutors pointed to a rambling text that Carter sent to a friend two months later in which she said called Roy's death her fault and said she told Roy to "get back in" the truck.
Daniel Marx, who argued the case before the Supreme Judicial Court, said last week that the court's ruling "stretches the law to assign blame for a tragedy that was not a crime."
"It has very troubling implications, for free speech, due process, and the exercise of prosecutorial discretion, that should concern us all," he said.
The family of Conrad Roy has long said there are no winners in this case, but today they do feel as though justice was served.
"We're happy that this is the end of the process," said Becki Maki, Roy's aunt, while acknowledging there is still the appeal process. "This is a day that we've been looking forward to. We hope that no one else ever has to feel this pain."
Michelle Carter Due in Court Amid Sentencing
If you are in crisis, call the National Suicide Prevention Lifeline at 800-273-8255 or reach out to the Crisis Text Line by texting 'Home' to 741741.