An Unlikely Break in the Case

Confession from an unlikely suspect who gunned down a Texas D.A., his wife and a prosecutor.
3:00 | 04/17/13

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Transcript for An Unlikely Break in the Case
N and now we want to tell you about a startling development in the point-blank murders of a texas district attorney, his wife, at their home and also an assistant prosecutor. Here's the twist, the confession from someone few people could have imagined. Abc's senior justice correspondent pierre thomas with the latest. Reporter: In little town kaufman, texas, justice of the piece eric williams and his wife kim were known as solid citizens. AND WHEN mark McLelland and his wife were gunned down, williams expressed his sympathies. My heart goes out to all the families that have been affected by this tragedy. Anything that the public can help. Not that we're releasing pch. Reporter: But today authorities say the killers were none other than eric and kim williams. Kim lene williams, 46, of kaufman, has been arrested and charged with the offense of capital murder. Reporter: Please say she confessed to her involvt. According to court documents, her husband shot to death the McLELLANDS AND ALSO MR. HASSE Gunned down near the courthouse in january. McLELLAND PROSECUTED WILLIAMS For stealing government computers. He called williams a flat-out thieve and burglar and needs to be removed from office. DISTRICT ATTORNEY mark McLelland described the case as an example of the fox watching the hen house. Williams was convicted of theft, his reputation and livelihood destroyed. After the most recent murders, investigators quickly suspected williams, he denied everything. But police stay on the case, searching his home and rental storage property. It makes me feel that the police are doing the thorough job they need to. Reporter: They apparently did. Capital murder charges are expected against eric williams as early as tomorrow. Pierre thomas, abc news, washington.

This transcript has been automatically generated and may not be 100% accurate.

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