"Uncommon to rare ... Perches on high exposed branch or wire when foraging for sdmall birds or rodents. Very similar to Loggerhead Shrike, but larger, nore narrower dark mask with white markings around eye ... large bill with obvious hook." (David Allen Sibley's The Sibley Field Guide to Birds of Eastern North America. P. 272)

"Rare to very rare winter resident in the Panhandle and casual on the South Plains. Northern Shrikes are casual to accidental visitors on the Rolling Plains away from the Panhandle, as well as in many other areas of the state" (Mark W. Lockwood & Brush Freeman's The TOS Handbook of Texas Birds. P. 132.)

All the above makes a Northern Shrike at this location problematical, but observe this comparison.
Even with the hooked beak on this bird, the comments from Sibley and Lockwood & Freeman suggest that the identification be tentative.

I have not yet counted it among the attested birds.

Photo taken with a Nikon D300 with a Nikon 400, f/5.6.

November 7, 2015.