A judge is refusing to block a doctor's testimony in the case of a man accused in the 2011 deaths of his estranged wife and stepson in Montgomery County, the Associated Press reported.

Curtis Lopez, 46, was indicted on two counts of murder, two counts of kidnapping and one count of robbery.

He is accused of stabbing and beating 51-year-old Jane McQuain to death in her Germantown apartment. He then allegedly picked up her son, 11-year-old William McQuain, from a friend's house and killed him in a wooded area of Clarksburg, beating him with a baseball bat. The skulls of both mother and son were crushed.

Lopez's lawyers asked a judge to block the testimony of a medical expert who examined William's skull. They said the expert's testimony would put them at a disadvantage because their experts didn't have the opportunity to examine it, the AP reported.