But Carter had sent Roy scores of texts encouraging him to kill himself.
Prosecutors allege Carter pushed Roy to commit suicide because she was desperate for attention and sympathy from classmates, and wanted to play the role of a grieving girlfriend.
In convicting Carter, the judge focused his ruling on Carter telling Roy to "get back in" after he climbed out of his truck as it was filling with carbon monoxide and told her he was afraid. He can commit her to a Department of Youth Services facility until she turns 21 on August 11.
According to Independent.ie, the verdict has not yet been decided and it is unclear whether she will get a lesser sentence than 20 years. Carter's father said his daughter made "a tragic mistake", and is asking for probation and continued counseling.
"I'm sorry I couldn't save you, I'm sorry I let you do this", she wrote, Boston.com reported.
"You can encourage someone to die via text, and you can commit a crime via text", Rayburn said in her closing statement to Moniz.
Ahead of Carter's sentencing Thursday, Roy's family had urged the judge to impose the maximum 20-year sentence. "She preyed on his vulnerabilities, he trusted her, which in turn, cost him his life". Roy was depressed and had tried to kill himself before, while Carter, who had an eating disorder and said she had been cutting herself, had been treated in a psychiatric hospital. "48 Hours" investigated the case in the episode, Death by Text. "Though some punishment would be appropriate - and I think the judge also needs to deter copy cats", he said.
The sensational trial was closely watched on social media, in part because of the insistent tone of Carter's text messages. You're just making it harder on yourself by pushing it off.
"When are you gonna do it?"
"She will forever live with what she has done and I know will be a better person because of it", David Carter wrote in his letter. Carter and Roy had met on vacation in Florida through their families, but once both were back in MA, they rarely saw each other.
She was on medication for her own issues at the time and suffered suicidal thoughts. They struck up an off-and-on relationship that was conducted nearly entirely via texts and Facebook messages, included frank discussions of depression, eating disorders and both teens' emotional frailty.
Cataldo said during the trial that Carter was a troubled teen who was on Celexa, a treatment for depression, which can trigger side effects like irrational thinking, irritability and poor impulse control. A controversial psychiatrist testified that Carter was "involuntary intoxicated" on antidepressants before Roy's suicide, which led her to become "grandiose" and "delusional".
She is scheduled to be sentenced at 2 p.m.in Taunton.