LA MARQUE, Texas (AP) —
    Investigators believe a 14-year-old boy who's charged with killing his pregnant mother acted alone, a police chief said Tuesday.
    La Marque Police Chief Kirk Jackson did not release a possible motive for the slaying of the mother, 33, whose body was discovered Saturday in her home. Her son was found Sunday in Houston, along with a vehicle from the family's home, then charged with a juvenile count of murder, police said.
    "There's no indication that there was anybody involved in this," Jackson said Tuesday, adding that officials believe "he acted alone."
    Details of the woman's death have not been released. An autopsy was scheduled Tuesday, Jackson said.
    Jackson declined to say whether police found weapons or any signs of a struggle at the residence, where mother and son recently moved. Police had not previously received any disturbance calls, according to the police chief.
    "They had just moved to this house not too long ago. We don't have any prior history at that house," Jackson said.
    Jackson had no information about the boy's father or an attorney for the teen, who remained in juvenile custody and has cooperated with investigators, the police chief said.
    Police were not sure if the woman had any other children. She and the boy were the only ones living in the house, , Jackson said.
    A Child Protective Services spokeswoman declined to offer information about the boy's history, according to the Houston Chronicle. Court documents indicate the woman at one point had a legal dispute over paternity and custody of a son, amid "a history or pattern of child neglect," the newspaper reported. At one point CPS took custody of the child.
    It was unclear whether the CPS documents were referring to the boy charged with killing his mother or another child.
    The Associated Press left messages seeking comment from CPS, prosecutors and the coroner's office.