By the end of the week, the older brother, Lyle Menendez, appeared drained after nine days on the witness stand, including three and a half days of cross examination by the Deputy District Attorney, Pamela Bozanich. His confident demeanor during questioning by his lawyer had given way to memory lapses and fatigue as Ms. Bozanich confronted him with evidence that she said proved the brothers had killed to inherit the family fortune.