Meanwhile, Jordan Brown, now 12 and who has pleaded not guilty, is facing an adult trial, although his parents are trying to get the case moved to the juvenile justice system.
Pearson is also being charged as an adult, according to police.
And Kieshawn Mann, whose family and friends have crowded the Michigan courtroom for the pre-trial hearings this week to support him, is also facing adult charges in what police are calling a "cold-blooded killing."
According to relatives of the victim, Stokes had been a father figure to the 13-year-old since he was only 3.
"The entire family of the victim declined to talk," said ABC reporter Lambrini Lukidis, who is covering the trial for Michigan's WZZM. "They are close to the little boy -- even the mom of the stepfather. Obviously she is upset Stokes passed away, but she's not saying anything negative about the boy."
"Every time he is in court, 50 to 60 people show up in support of the little boy -- his mom, family members, other kids and their parents and people from the school," said Lukidis.
Legal analysts admit that it is heartbreaking to see small children faced with adult crimes and hard sentences.
"The decision to prosecute a child as an adult is a difficult one," said former New York district attorney and television court judge Jeanine Piro, who prosecuted a 12-year-old killer as an adult.
"The choice is not about being 'hard' or being compassionate," she writes on her blog about the Brown case.
"It is about recognizing the evil that accompanies a killer's choice to take the life of an innocent pregnant woman and mother of two, whose children will never get to hug their mother again because an angry 'boy' with a gun decided she should die."