For those wondering, the search warrant was necessary for police to retrieve the body and process the crime scene. He was unable to provide consent for them to be there and they probably could not guarantee that another party did not have a right to privacy. Some of the first responders probably smelled MJ smoke which is why that was added to the warrant, since it's still illegal in TX. Investigators will look at all angles in a case like this. The warrant becomes public record as soon it is filed with the clerk's office unless it is filed under seal. This case is getting a lot of media attention so the media would have gotten the heads up on the warrant.
I think there's more to this story. I saw a photo yesterday with the suspect and the victim together. Perhaps a lover's quarrel? She was obviously not there on official business.