In July, 2014, Roy was found dead in his pickup truck from carbon monoxide poisoning, according to police.
Prosecutors said that Carter, 17 years old at the time, had sent Roy numerous text messages repeatedly telling him to follow through on a plan to kill himself.
"You need professional help like me", Carter wrote to Roy, a month-and-a-half before his suicide.
She waived her right to a jury trial, meaning her case will be decided by Judge Moniz, who will render a verdict after testimony is over.
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The judge will be tasked with determining if the unique set of facts fall under the involuntary manslaughter statute in MA.
"At the moment, there's really no law on the books in MA about whether somebody can encourage somebody to commit suicide or not", he said.
One of the allegations involves Carter communicating with Roy as he was trying to asphyxiate himself with vehicle exhaust. The defendant 'f-- told him to get back in, ' " Flynn said, quoting Carter's texts to a friend shortly after Roy's death.
Cataldo noted the young's man extensive online searches about suicide, Carter's attempts to get him to seek help and her own bouts with mental issues.
Among those were texts she sent that stated: "You always say you're gonna do it, but you never do". "Her behavior was wanton and reckless and because of her, Conrad is dead".
"Are you going to do it today?"
"The defendant is hoping that the judge will acquit or dismiss the case by following traditional notions of causation", said Joseph E. Kennedy, a professor who teaches criminal law at the University of North Carolina, adding that cases like this could nevertheless raise hard questions about suicide and criminal liability. This time is right and you're ready. What prosecutors will have to prove this week is whether Carter's encouragement resulted in his death.
I just want to make sure tonight is the real thing.
But after he began taking medication and went to counseling, he seemed much better, Lynn Roy said.
Some similar cases have involved less serious charges than manslaughter.
Boston defense attorney Peter Elikann told CNN affiliate WFXT that lawyers and legal scholars are watching the trial closely because it could set a legal precedent. "While jurors who are unaccustomed to the disgusting nature of criminal activity, they could react emotionally to facts like these and hold it against her".