The Summerville woman who pleaded guilty to charges involving the death of her former boyfriends’ 2-year-old son is expected to be sentenced on Tuesday.

Grace Trotman, 27, of Longbourne Way, pleaded guilty on Feb. 16 in circuit court in Charleston County to one count of homicide by child abuse and one count of desecration of human remains in connection to the death of Rodricus Williams. The boy was found concealed in a trash can of concrete in Orangeburg in 2010.

Trotman signed a plea agreement with prosecutors in which they agreed to drop a charge of unlawful conduct toward a child in exchange for her guilty plea on the other two charges. She also agreed to cooperate with authorities in exchange for a 20-year sentence on each remaining charge, to be served concurrently.

She held up that part of the deal in October when she testified in the trial of Roger Williams, the boys father who had been charged with homicide by child abuse. He was found guilty and sentenced to life in prison.

Trotman will be sentenced by Circuit Judge Markley Dennis, the same judge who presided over Williams’ trial in Moncks Corner.

Rodricus Williams’ body was found after Williams and his former girlfriend Grace Trotman concocted a story that the boy had gone missing after falling into the water off The Battery in downtown Charleston on July 6, 2010.

Search crews spent hours looking to no avail. According to affidavits, Trotman admitted to an FBI agent that she made up the missing-child story to cover up the boy’s death and led them to the body’s location.

Reach Natalie Caula at 937-5594 or Twitter.