Story highlights David Conley, 48, has been charged with capital murder, an official says

Authorities: His motive appears to be related to the mother of the children

(CNN) A suspect in the killing of eight people in Texas broke into their house and handcuffed the victims in their bedrooms -- then shot them, authorities said.

David Conley was charged with capital murder after deputies discovered the bodies of two adults and six children in their Houston-area home early Sunday.

Conley, 48, forcibly entered the home because the owners had changed their locks, authorities said.

His motive appears to be related to the mother of the children, who had a past relationship with him, Harris County Sheriff's Chief Deputy Tim Cannon said.

One -- and possibly two -- of the children killed might have been the suspect's, authorities said.

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