The defense for a Massachusetts woman accused of encouraging her boyfriend to kill himself in a string of text messages is trying to get a psychologist to testify in her upcoming trial.

Frank DiCatalado was in court Friday so a judge can decide whether he is allowed to provide expert testimony in the trial for Michelle Carter.

According to DiCataldo, teenagers are not as capable of understanding their actions compared to adults.

Carter, now aged 20, is set to stand trial in June. She is charged with manslaughter in the 2014 death of 18-year-old Conrad Roy III.

Carter was 17 when Roy took his own life via carbon monoxide poisoning and prosecutors argue she is criminally responsible because she encouraged him to kill himself in a series of text messages.

Scroll down for video

Michelle Carter, now aged 20, is set to stand trial in Massachusetts in June charged with manslaughter in the 2014 death of 18-year-old Conrad Roy III. She is pictured during a pre-trial hearing on October 14, 2016

Conrad Roy III (above) took his own life via carbon monoxide poisoning in 2014. Prosecutors argue Carter is criminally responsible because she encouraged him to kill himself

Carter wants DiCataldo to be able to give testimony concerning the adolescent versus adult mind, the Boston Herald reported Saturday.

Her defense, per the paper, said DiCataldo's testimony would be speaking about the adolescent versus adult mind broadly, not delving into the details of the Carter case.

Prosecutor MaryClare Flynn was quoted as asking DiCataldo: 'A layperson has the same information about juveniles being irrational or less mature than adults, isn't that true?

Psychologist Frank DiCatalado was in court Friday so a judge can decide whether he is allowed to provide expert testimony in the June trial for Michelle Carter

'Do you need an expert to inform a jury that juveniles are less mature than adults?'

She said: 'This witness does not offer anything but confusion to the jury by generally speaking about juveniles as a class, and I would suggest that the court has a very important role as gatekeeper here.'

DiCataldo said he'd provide an understanding of the adolescent mind that's more than what a layperson knows, the report said.

He was quoted as saying: 'Generally speaking, an adolescent would be less capable than an adult of understanding or appreciating all of the potential ramifications of their actions.

'They would have an underdeveloped ability to appreciate the consequences and understand what the risks are.'

The judge did not immediately rule on if DiCataldo can testify, the Herald reported.

Prosecutors say Carter sent her boyfriend dozens of text messages urging him to take his own life before he was found in his pickup truck in Fairhaven, Massachusetts on July 13, 2014

Last month, a controversial psychiatrist said Carter was 'involuntarily intoxicated' by prescribed antidepressants when she texted her boyfriend encouragement as he committed suicide.

Psychiatrist Dr Peter Breggin faced Taunton Juvenile Court on March 22 so a judge can decide whether he is allowed to provide expert testimony in Carter's upcoming trial.

But Dr Breggin testified that Carter was not responsible because she was being treated with the antidepressant Celexa in 2014, which would have altered her brain and meant she wouldn't have understood the impact of her texts to Roy.

'She had no notion of wrongfulness on what she was doing,' Dr Breggin told the court, according to 12WPRI.

Dr Breggin has testified that Carter was not responsible for Roy's death because she was being treated with the antidepressant Celexa in 2014, which would have altered her brain

Dr Breggin, who was hired by defense attorneys, said Carter loved Roy but experienced a metamorphosis due to her medication.

'The impairment of being on the drugs while you are growing up - while you're brain is maturing, while your frontal lobes are developing - you're talking about being inundated with neurotoxic effects,' he said.

Prosecutors criticized Dr Breggin's credentials during cross-examination and sought to discredit him as an 'extremist' who was critical of antidepressants.

Assistant District Attorney Katie Rayburn pushed Dr Breggin to admit he only reached his conclusion about Carter based on medical records and the text exchange between her and Roy.

The judge did not immediately rule on whether Dr Breggin can testify. The psychiatrist has been previously banned from testifying in other cases.

Carter's defense team were granted a request late last year for funds to hire an expert to examine the antidepressant she was taking at the time.

Carter had posted on social media on the day Roy committed suicide saying he had 'gone too soon'

Her attorney Joseph Cataldo said at the time the drug Celexa could be the key to her defense because it can increase suicidal thoughts.

The case involving Carter has drawn national attention after transcripts of the text messages sent between the couple were made public.

Prosecutors say Carter sent her boyfriend dozens of text messages urging him to take his own life.

Carter's lawyer argue that she tried repeatedly to talk him out of it and only began to support the plan when it became clear he would not change his mind.

Roy's body was found in his pickup truck in Fairhaven, Massachusetts on July 13, 2014.

Police found a gasoline-operate water pump in the back seat of the truck after he died. A coroner later ruled he died of carbon monoxide poisoning.

For confidential help, call the National Suicide Prevention Lifeline at 1-800-273-8255 or visit suicidepreventionlifeline.org.