New details on two men who allegedly murdered Lubbock doctor - KFDA - NewsChannel 10 / Amarillo News, Weather, Sports

New details on two men who allegedly murdered Lubbock doctor

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Dr. Joseph Sonnier III Dr. Joseph Sonnier III
Dr. Thomas Michael Dixon Dr. Thomas Michael Dixon
David Neal Shepard David Neal Shepard

AMARILLO, TX - New details have surfaced into the murder investigation of  Dr. Joseph Sonnier III.

Police charged Dr. Thomas Michael Dixon, 48, and David Neal Shepard, 51 with murder Monday.

Dixon remains locked up in a Lubbock County jail while Shepard is behind bars in Randall County.

Dr. Dixon said nothing as Lubbock Police escorted him into jail late Monday afternoon.

Meanwhile, NewsChannel 10 has learned this isn't Shepard's first encounter with the law.

The Randall County Sheriff's Department says when Shepard was arrested, he had an outstanding warrant stemming from a theft by check charge in 2011.

Shepard's ex-wife, Laurie, lives in an Amarillo apartment complex. The two have three children and had been married since 1989.

They divorced in Randall County in 2010.

NewsChannel 10 went to her apartment for comment, but were unsuccessful at reaching her.

Like Dixon, Shepard has ties to the medical world, as the director of Physician Ancillary Services located at 6523 Storage Drive. 

We went to the address provided by Google Maps only to discover the building was vacant.

NewsChannel 10 also learned Dixon and Shepard are friends on the social networking site, Facebook. However, we don't know the extent of their relationship. 

Tuesday afternoon, we discovered that in the mid 90's, Dixon was a research assistant in Texas Tech's Department of Pathology. This is the same field Dr. Sonnier specialized in.

It is still unknown whether Sonnier knew Dixon.

Both Dixon and Shepard could spend the rest of their lives behind bars if convicted.