On “Jake and the Fatman” each Tuesday...

On “Jake and the Fatman” each Tuesday night on CBS, William Conrad plays a tough district attorney who more often than not is a grouchy, bah-humbug type of fellow.

But Conrad abandoned his usual dour expression to don a Santa cap for a holiday photo, even trying to coax a happy look out of Max, the aging bulldog that’s his constant companion on the show.

Actually, Conrad has reason to smile: CBS has picked up “Jake and the Fatman” for the full season.