NEW DETAILS IN CONGRESSWOMAN SHOOTING: Shooter Posted 'I'll See You On National TV' & Police Find 'Person Of Interest'

Twenty people were shot, six of them killed, in Tuscson, Arizona on Saturday in a sudden act of violence that has stirred debate about superheated political rhetoric and caused President Obama to dispatch the head of the FBI to oversee the criminal investigation.

Jared Lee Loughner is now in the custody of the FBI and identified as the shooter. Authorities are searching for a second man who they say was at the scene and is a person of interest.

The 'person of interest' is a white male, approximately 40 to 50 years old with dark hair. He was last seen wearing blue jeans and a dark blue jacket. The photograph was released by the Pima County Sheriff’s office and taken from a surveillance video camera at the shopping center.

Meanwhile more of Loughner’s bizarre online postings have been uncovered in the aftermath of the tragedy. One of the most disturbing read: "WOW! I’m glad i didn’t kill myself. I’ll see you on National T.v.! This is foreshadow .... why doesn’t anyone talk to me?.."

That was posted in mid-December, about the same time as his bizarre videos were posted, according to the Arizona Republic. He also posted: “I don’t feel good: I’m ready to kill a police officer! I can say it."

Giffords, 40, was shot in the back of the head. But she emerged from heavy sedation Sunday morning and a medical spokesperson said she was able to follow commands, a very good sign, according to  her doctors.

One hero who emerged from the order is Daniel Hernandez, a 20-year-old intern in Giffords’ office. He rushed to help her and tried to keep her stable until paramedics arrived.

"I don't know how much time it took, Hernandez said in an ABC-TV interview Sunday. "It seemed like it took an eternity, but that's just because of the way that the events were unfolding, because I was trying to make sure that I was holding the congresswoman so that she could still breathe well, but also make sure that I was holding her wound so that she didn't -- so that she was in good enough condition to be able to be transported by ambulance to a hospital."

The alleged shooter was suspended from Pima Community College, in Tucson on September 29, 2010 after campus police had contact with him five times. Classmates described his behavior as bizarre and the school said he agreed to withdrew from the college on Oct. 4.

Administrators met with Loughner and his parents and said he needed a certificate that "in the opinion of a mental health professional, his presence at the College does not present a danger to himself or others” in order to come back to school.