A young Massachusetts woman accused of sending her boyfriend dozens of text messages urging him to kill himself when they were teenagers was found guilty of involuntary manslaughter Friday.

Michelle Carter was charged in the death of Conrad Roy III. Carter, then 17, cajoled Roy to kill himself in July 2014 with a series of texts and phone calls, prosecutors alleged. Roy died when his pickup truck filled with carbon monoxide in a store parking lot in Fairhaven. After he exited the truck, Carter told him to "get back in," prosecutors said.

Prosecutors allege Carter pushed Roy to commit suicide because she was desperate for attention and sympathy from classmates, reports CBS Boston, and wanted to play the role of a grieving girlfriend. Carter's lawyer, Joseph Cataldo, said Roy was intent on killing himself and took Carter along on his "sad journey."

Carter waived her right to a jury trial, so Juvenile Court Judge Lawrence Moniz decided the case. He began deliberating late Tuesday after closing arguments concluded and read his verdict Friday morning.

While Roy took "significant actions of his own" to take his own life, Carter's instruction to get back in the truck constituted wanton and reckless conduct, the judge said. Even though she knew he was in the truck, she didn't take action to help him by calling the police or his family, Moniz said.

"She called no one and finally she did not issue a simple additional instruction -- get out of the truck," Moniz said.

Carter cried as the judge read his verdict and sobs broke out in the courtroom.

The judge set sentencing for Aug. 3. He ruled that Carter, now 20, can remain free on bail but ordered her not to make any contact with Roy's family and not to leave the state. She faces a sentence of probation to 20 years in prison.