When Texas millionaire John Poindexter invited Justice Antonin Scalia to his remote ranch near the Mexican border, it was for a private party with about 35 other guests, a weekend of hunting and sightseeing on his painstakingly restored and cultivated 30,000-acre spread. But when Scalia, 79, failed to appear for a morning excursion at 8 a.m. Saturday, Poindexter became concerned and went to his room, which has its own outdoor fire pit and a wall of windows overlooking the 22-room adobe ranch hotel, a lake and surrounding peaks of the Chinati Mountains. "I had not seen him, and everyone else...