PHOENIX (AP) " A 22-year-old man described as a social outcast with wild beliefs steeped in mistrust faces a federal court hearing on charges he tried to assassinate Rep. Gabrielle Giffords and killed others in a Tucson shooting rampage.
Public defenders are asking that the attorney who defended Oklahoma City bombing conspirator Timothy McVeigh and "Unabomber" Ted Kaczynski defend Jared Loughner, who makes his first court appearance Monday afternoon.
Read more: Was the shooter motivated by politics?
The hearing in Phoenix comes just a few hours after President Barack Obama leads a shocked and saddened nation in a moment of silence for the victims and their families at 1 p.m. MST (11 a.m. EST).
As authorities filed the charged against Jared Loughner, they alleged he scrawled on an envelope the words "my assassination" and "Giffords" sometime before he took a cab to a shopping center where the congresswoman was meeting with constituents Saturday morning.
A federal judge, a congressional aide and a young girl were among the six people killed, while Giffords and 13 others were injured in the bursts of gunfire outside a Tucson supermarket.
Giffords, 40, lay in intensive care at a Tucson hospital, after being shot in the head at close range. Doctors said she had responded repeatedly to commands to stick out her two fingers, giving them hope she may survive.
About 200 people gathered outside Giffords' Tucson office Sunday evening for a candlelight vigil. Earlier in the day, people crammed the synagogue where Giffords has been a member, as well as the Mountain Avenue Church of Christ, which lost one member in the attack and saw another one wounded.
"I don't know how to grieve. This morning I don't have the magic pill, I don't have the Scripture... I can't wrap my head around this," said the church's Rev. Mike Nowak, his strong preacher's voice wavering.
Authorities weren't saying late Sunday where Loughner was being held, and officials were working to appoint an attorney for him. Heather Williams, the first assistant federal public defender in Arizona, said they're asking that San Diego attorney Judy Clarke be appointed.
Clarke, a former federal public defender in San Diego and Spokane, Wash., served on teams that defended McVeigh, Kaczynski and Susan Smith, a South Carolina woman who drowned her two sons in 1994.
Loughner is charged with one count of attempted assassination of a member of Congress, two counts of killing an employee of the federal government and two counts of attempting to kill a federal employee. More charges are expected.
Discoveries at Loughner's home in southern Arizona, where he lived with his parents in a middle-class neighborhood lined with desert landscaping and palm trees, have provided few answers to what motivated him.
Court papers filed with the charges said he had previous contact with Giffords. The documents said he had received a letter from the Democratic lawmaker in which she thanked him for attending a "Congress on your Corner" event at a mall in Tucson in 2007.
Investigators carrying out a search warrant at his parents' home in a middle-class neighborhood found an envelope in a safe with the words "I planned ahead," ''My assassination" and the name "Giffords" next to what appears to be his signature.
Neighbors said Loughner kept to himself and was often seen walking his dog, almost always wearing a hooded sweat shirt and listening to his iPod.
Comments from friends and and former classmates bolstered by Loughner's own Internet postings have painted a picture of a social outcast with almost indecipherable beliefs steeped in mistrust and paranoia.
"If you call me a terrorist then the argument to call me a terrorist is Ad hominem," he wrote Dec. 15 in a wide-ranging posting.
Two high school friends said they had fallen out of touch with Loughner and last spoke to him around March, when one of them was going to set up some bottles in the desert for target practice and Loughner suggested he might come along. It was unusual " Loughner hadn't expressed an interest in guns before " and his increasingly confrontational behavior was pushing them apart. He would send bizarre text messages, but also break off contact for weeks on end.
"We just started getting sketched out about him," the friend said.
Around the same time, Loughner's behavior also began to worry officials at Pima Community College, where Loughner began attending classes in 2005, the school said in a release.
Between February and September, Loughner "had five contacts with PCC police for classroom and library disruptions," the statement said. He was suspended in September after college police discovered a YouTube video in which Loughner claimed the college was illegal according to the U.S. Constitution.
He withdrew voluntarily the following month, and was told he could return only if, among other things, a mental health professional agreed he did not present a danger, the school said.
Police said he purchased the Glock pistol used in the attack at Sportsman's Warehouse in Tucson in November.
An official familiar with the shooting investigation said Sunday that local authorities were looking at a possible connection between Loughner and an online group known for white supremacist, anti-immigrant rhetoric.
The official, who spoke on condition of anonymity to discuss the ongoing investigation, said local authorities were examining the American Renaissance website for possible motives.
The group's leaders said in a posting on their website that Loughner never subscribed to their magazine, registered for any of the group's conferences or visited their Internet site.
Giffords, a conservative Democrat re-elected in November, faced threats and heckling over her support for immigration reform and the health care overhaul. Her office was vandalized the day the House approved the landmark health care measure.
It was not clear whether those issues motivated the shooter to fire on the crowd gathered to meet Giffords.
The six killed included U.S. District Judge John Roll, 63, and 9-year-old Christina Taylor Green, who was born on Sept. 11, 2001, and was featured in a book called "Faces of Hope" that chronicled one baby from each state born on the day terrorists killed nearly 3,000 people.
The author, Christine Naman, said: "Tragedy seems to have happened again."
Green was recently elected as a student council member and went to the morning's event because of her interest in government.
Others killed were Giffords aide Gabe Zimmerman, 30; Dorothy Morris, 76; Dorwin Stoddard, 76; and Phyllis Scheck, 79.
Associated Press writers Pauline Arrillaga, Raquel Maria Dillon, Justin Pritchard, Terry Tang in Tucson, Sophia Tareen in Chicago and Eileen Sullivan in Washington contributed to this report.
(This version CORRECTS Corrects site of court appearance and reference to time in paragraph 3. Court hearing set for 2 p.m. MST. An interactive that includes a timeline of Rep. Gabrielle Giffords' life and career as well as an interactive map of Tucson, Ariz., that includes pictures from the scene of the shooting, is available, "national/congresswoman-shot. AP Video.)Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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