LA MARQUE, Texas (AP) —
    A 14-year-old boy accused of killing his pregnant mother had twice been removed from her custody because of the woman's substance abuse and her partner's domestic violence, child welfare officials said Tuesday.
    La Marque Police Chief Kirk Jackson said investigators believe the boy acted alone in killing the woman. 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.
    Details of the woman's death have not been released.
    Estella Olguin, spokeswoman for Harris County Child Protective Services, said another son also was removed from the woman's custody less than a month after his birth for the same reasons as the older boy.
    The teenage suspect was first removed from her custody in October 2005 and was in foster care until his paternal grandmother received custody of him in March 2007, she said. He again was removed from his mother's custody in April 2010 and was in foster care until his father was awarded custody in February 2011.
    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 at that home, 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.
    Prosecutors are waiting until the criminal investigation is complete to decide whether to seek to prosecute the teen as an adult, said Paul Love, chief of the misdemeanor and juvenile division of the Galveston County District Attorney's Office.