Q. I have always been a Robert Urich fan. Please give me an update on his health. - E.S., Las Vegas, Nev.
A. Urich is undergoing chemotherapy for a rare but treatable form of cancer that was discovered last month. For now, the second season of Urich's syndicated Western series "Lazarus Man" has been canceled, although there are still seven new episodes which will air in October and November.
Q. What is Tom Selleck doing. How can I write to him? - M.S., Taylor, Texas
A. The former "Magnum, P.I." star has signed to do a series for CBS in the fall of 1997. Meanwhile, he may appear in a few more "Friends" episodes this fall as Richard (Selleck) and Monica's (Courteney Cox) affair hits the rocks. Write to him c/o CBS, 7800 Beverly Blvd., Los Angeles, Calif. 90030.