William McQuain, the 11-year-old Germantown boy found dead after he went missing for two weeks, was killed by his mother’s estranged husband who slammed a baseball bat into his head, Montgomery County prosecutors alleged Thursday.

The suspect, Curtis Lopez, has been charged with killing William’s mother, Jane McQuain. He has not been charged in connection with William’s death, but prosecutors said they will file charges.

During a Thursday bond hearing in Montgomery District Court, prosecutors indicated that Lopez struck Jane McQuain in the head with a 30-pound weight and stabbed her through a blanket. “It looks like she was killed in her sleep,” Montgomery County Deputy State’s Attorney John Maloney said in court.

Jane McQuain was found dead Oct. 12. William’s body was found Oct. 18 after an extensive search.

Lopez was arrested in North Carolina and brought to Maryland to face charges.

Lopez’s attorney said the case built against him is circumstantial, and that a reasonable bond should be set. A judge ordered him held without bond.