Dr. Bret Stolp says the three are alert, talking and walking. He says the three will receive a third hyperbaric oxygen treatment and could be released either tomorrow or Wednesday. Stolp also says the three had no memory of the event. More than 20 people were sickened by carbon monoxide poisoning at an off-campus apartment complex on Sunday. Two people are in critical condition. A Springfield, Va., woman whose daughter was killed in last spring's shootings on the Virginia Tech campus endured a new terror with the latest incident. Her younger daughter had just moved into the complex, but she was not injured.