Carter is charged with involuntary manslaughter for allegedly encouraging her boyfriend, 18-year-old Conrad Roy, to kill himself in 2014.
In openings, prosecutors argued Michelle Carter craved sympathy and attention from other girls at school, seeking to be the "grieving girlfriend" who wasn't able to stop her boyfriend from killing himself.
The court also heard how Carter allegedly carried out a "dry run" on July 10, 2014 - two days before Conrad was found dead of carbon monoxide poisoning in his pickup truck.
"The state has got to show not just that there was encouragement, but that Ms. Carter killed this young man with her words, and that's a really significant obstacle for the prosecution", Matthew Segal, of the ACLU of MA, told The New York Times.
Her defense tried to make the point that there were multiple times where Carter had talked Roy out of committing suicide.
The opening statements in the Michelle Carter trial got underway around 9:30 a.m., according to WPRI.
Carter's attorneys will likely argue the Plainville woman broke no law and was exercising her right to free speech. Jury selection was set to begin Monday, but Carter opted for a bench trial, which means her fate will be decided by the judge and not by a jury.
"This is a suicide case", he said, "not a homicide".
On the last day of Conrad Roy III's young life, the text messages popped up on his phone, one after another.
Roy's mother was the first witness called by the prosecution. And can a person be found guilty of killing someone based exclusively on what she said in text messages?
On the day Roy killed himself, Carter texted, "You can't think about it, you just have to do it", according to the prosecutor.
Carter was admitted to a hospital with her own mental health struggles for a period prior to Roy's suicide and was taking anti-depressant medications known to cloud the judgment and impulse control of adolescents, Cataldo said.
The text messages a MA woman sent to the mother of her boyfriend after his death were warm and comforting.
Flynn presented text messages in court of the conversations Carter and Roy had about his suicide. "I'm just so confused like you were so ready and determined", she said.
A teenager charged with using text messages to encourage her boyfriend to kill himself played a "sick game" with another person's life, a prosecutor said Tuesday.
It came as Conrad's mother, Lynn Roy, took to the stand today to testify that she took a walk on the beach with her son hours before he was found dead. She also received text messages from Carter offering support after her brother's death, but no indication they had been in contact.
Under cross-examination she acknowledged there was tension between her son and his father, from whom she was divorced. Her brother did not seem sad at the beach, she testified. She is being tried as a youthful offender, a status that allows harsher punishments than typical juvenile cases and allows for court files to be open to public inspections.