Remember that newspapers do not print obituaries for everyone who dies.
Search Texas death records may be tricky, depending on the timing. Friends of the decedent have to get various papers signed before filing with the county, including the doctor who pronounced the person dead. Getting those signatures may be quick, or .. not.
If there is autopsy, the whole process will not take place until it is concluded. If it’s a criminal case, it may take longer.
Then the paperwork goes to the state, and gets into their process of data entry.
So…. if the death was recent, the records may not have been entered yet.