Mexican immigrant married American woman so he could get a Green Card then 'murdered her with the help of his real wife'
- Francisco Valdivia and Rosalina Lopez are accused of murdering Cecelia Bravo
- Bravo has been missing since June, but her body has not been found
- Authorities claim Valdivia married Bravo so he could get legal permission to stay in the US
- The motive is believed to be connected to the relationship between the three