The U.S. Supreme Court has declined to hearMichelle Carter‘s appeal of her conviction for urging her teen boyfriend via texts and phone calls to kill himself.

Without comment, the courtrevealed its rejection of the appealon Monday.

Carter, who is serving a 15-month sentence, was 17 on July 13, 2014, when Roy was found dead from carbon monoxide poisoning in his pickup truck in the parking lot of a Fairhaven Kmart.

In hundreds of texts and statements that came to light afterward, Carter was revealed to have pressured Roy to go through with the act. The judge who found her guilty cited Carter’s written admission to a friend that, after Roy got out of the truck and shared his last-minute fears with Carter in a phone call before he died, she told him to “get back in” the truck.

Michelle Carter.AP/REX/Shutterstock

Texting Suicide - 11 Feb 2019

Both teens had struggled with depression, and Roy had made previous attempts at suicide.

Although Carter’s defense acknowledged her exchanges with Roy, her attorneys argued that prosecutors had“cherry-picked”only those text messages that served their case against her, ignoring others in which Carter urged Roy toward help for his struggles.

F:PHOTOMediaFactory ActionsRequests DropBox47756#MassliveScreen Shot 2017-06-08 at 3.07.15 PM copy.jpg

Want to keep up with the latest crime coverage? Sign up forPEOPLE’s free True Crime newsletterfor breaking crime news, ongoing trial coverage and details of intriguing unsolved cases.

But police said Carter deliberately misled friends in the days and hours before Roy died, claiming to them that he’d gone missing at the same time the two of them were in contact.

“She did nothing,” Bristol County Juvenile Court Judge Lawrence Moniz said atCarter’s sentencing. “She did not call the police or Mr. Roy’s family. Finally, she did not issue a simple additional instruction: ‘Get out of the truck.’”

Glenn C.Silva/Fairhaven Neighborhood News/Pool

Texting Suicide

Seven months into her 15-month sentence, Carter sought permission from the Massachusetts parole board toto be set free early. In September, that request also was denied.

The decision added, “Ms. Carter needs to further address her causative factors that led to the governing offense.”

Contacted Monday, Darling said via email that Carter’s current end-of-sentence date is January 23.

source: people.com