ST. CLAIR COUNTY, Mich. - A St. Clair County woman who admitted to killing her son, Matthew Maison, has been sentenced to prison Friday.

Amanda Mae Maison, 33, of Port Huron Township, pleaded guilty to second-degree murder after admitting to killing her son in February 2018.

Amanda was in a relationship with Maurice Houle for two years, from 2016 up until the day of her son's death.

Amanda Maison (left) and Maurice Houle (right). (St. Clair County Sheriff's Office)

Court records show she admitted that Houle physically abused Matthew throughout their relationship and that she intentionally concealed her son's injuries from Child Protective Services and other law enforcement officials during investigations from 2016 through the murder investigation, the sheriff's office said.

She admitted that she had physically abused Matthew too, telling the court that she and Houle came up with a plan to conceal how her son died.

Matthew Maison (WDIV)

Amanda and Houle were both initially charged with first-degree murder in connection with Matthew's death. Their arrests came more than seven years after the boy was found dead.

St. Clair County Assistant Prosecuting Attorney Joshua Sparling detailed Matthew's abuse during their arraignments, saying that the couple would bang his head into the wall and lock him in his room for hours without food or water.

The autopsy showed that Matthew died from blunt force trauma from his injuries and possible suffocation, according to Sparling.

 Amanda admitted that she willfully and wantonly allowed an environment to exist, where Matthew would be systemically abused, and that those abuses eventually resulted in Matthew's death,  the sheriff's office said.

On Aug. 27, Houle was sentenced to 31 to 60 years in prison for his role in Matthew's murder.

On Sept. 11, Amanda was sentenced to nine to 15 years in prison.

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