Jessee Mackin has been charged with killing 6-month-old Larry Lord. The baby died in May 2015. Prosecutors maintain Mackin was the only person in home on Katahdin Avenue in Millinocket at the time who had the opportunity to harm the baby.
When the trial opened on Tuesday, one of the prosecutors told the judge Mackin was holding the infant when all of sudden the child became unresponsive.
In court on Wednesday, a pediatric child abuse specialist testified CAT scans taken at the time of the incident show compound fractures in Larry Lord's skull.
Dr. Lawrence Ricci said excessive brain swelling caused the baby's respiratory system to stop functioning almost instantaneously after being injured.
Under questioning from Assistant Attorney General Leanne Robbin, Ricci said it was not uncommon to see fractures this severe in a child but "I don't think I've seen any worse."
Under cross-examination by Mackin's defense attorney, Stephen Smith, Ricci said he was aware of medical and law enforcement reports citing abusive incidents involving the child's father, Anthony Lord. Smith also questioned Ricci about the medical science determining just how quickly a baby can fall into a coma following a blunt force trauma.
Anthony Lord is serving life sentences in Maine State Prison for a shooting spree in July 2015. He blamed the shootings, which included two murders, on his frustration with the failure of state police to charge anybody in his son's death.
One of the prosecutors said it is likely the trial will wrap up by the end of the week.