A team of investigators found Lauterbach and her unborn child dead on Friday.
Investigators believe Laurean burned and buried her body, and he was no where to be found.
Tonight, agencies in several states are working together in the search.
Police are not confirming this as an actual sighting, but they say Cesar Laurean was spotted by a Greyhound bus driver in Shreveport, Louisiana.
After the bus driver called the police, they arrived and surrounded the bus.
Laurean was not found, and no direction of travel could be given.
An unidentified Greyhound employee told officials that the driver was sure it was him, and that he bought a ticket under a different name.
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