<A HREF="http://www.cnn.com/2006/US/07/12/lay.lanier.ap/index.html">Former Houston Mayor Bob Lanier collapsed</A> Wednesday as he walked toward his seat at a memorial service for convicted Enron Corp. founder Ken Lay, eliciting shrieks from two women nearby and a rush of Secret Service agents. The agents were at the ceremony awaiting former President Bush and his wife, Barbara, and rushed to Lanier's side along with several doctors.