A Bakersfield woman who was charged with murder in the 2010 death of her 4-year-old son has accepted a plea agreement stipulating she be sentenced to 12 years and four months in prison. 

Alexis Dixon, 34, pleaded no contest Thursday to charges of voluntary manslaughter and willful cruelty to a child, according to court records. The murder charge has been dropped.  

Sentencing is set for March 6.

The son, Mark Dixon, suffered blunt force trauma to his head and abdomen and there were "dozens and dozens" of scars on his body, Kern County sheriff's investigators said. 

County firefighters were called to the Dixon family's trailer April 23, 2010, to a report of a possible seizure, according to the Sheriff's Office. The boy was taken to Kern Medical Center, where due to the severity of his injuries he was flown to Valley Children's Hospital in Madera.

He died the next day.

According to court documents, Alexis Dixon told investigators she was napping while her husband was cleaning a drain near their travel trailer in the 22000 block of Stockdale Highway when she awoke to a loud thud in another room. She said she saw her son on the ground and tried to get him to stand up, but he began vomiting. 

She took the boy outside and placed him against a brick wall while she called for her husband, according to her statement to investigators. As she yelled for help, the boy slid down the wall and struck his head on a pole.

Investigators said the child's injuries were inconsistent with Alexis Dixon's explanations. 

She wasn't arrested until 2014, in part because tissue studies and more investigation were needed, sheriff's officials said.

Years earlier, Alexis Dixon's first baby tested positive for methamphetamine and was taken by Child Protective Services, court documents said. She said she'd been using meth since she was 13.