They found no note or manifesto, and Lanza had no criminal history. Lanza said she was close with Nancy Lanza and had sent her a Facebook message Friday morning asking how she was doing. Image 5 of 42 Police block off a section of Yogananda Street near a house belonging to the mother of a man who opened fire inside a Connecticut elementary school, killing 26 people, including 18 children, Friday, Dec. 14, 2012 in Sandy Hook, Conn. Photo: AP 
 
 Police block off a section of Yogananda Street near a house... Meanwhile, as detectives continue to comb through evidence and talk to people who witnessed Friday's mass murder at Sandy Hook Elementary School, the state's chief medical examiner Dr. H. Wayne Carver has asked a geneticist at the University of Connecticut to join in his investigation of the killings. Image 7 of 42 Ambulances leave an area near the scene of a shooting at the Sandy Hook Elementary School in Newtown, Conn., about 60 miles (96 kilometers) northeast of New York City, Friday, Dec. 14, 2012. (AP Photo/Jessica Hill) Photo: Associated Press 
 
 Law enforcement canvass an area following a shooting at the Sandy... Image 17 of 42 Officials stand by a triage area near Sandy Hook Elementary School in Newtown, Conn., where authorities say a gunman opened fire inside the school in a shooting that left 27 people dead, including 20 children, Friday, Dec. 14, 2012. Image 21 of 42 NEWTOWN, CT - DECEMBER 14: Connecticut Gov. Dan Malloy observes a moment of silence with mourners gathererd inside the St. Rose of Lima Roman Catholic Church at a vigil service for victims of the Sandy Hook School shooting December 14, 2012 in Newtown, Connecticut. Carver said that Nancy Lanza died of four gunshots to the head from a .22-caliber rifle. Image 27 of 42 WASHINGTON, DC - DECEMBER 14: People gather outside the White House to participate in a candle light vigil to remember the victims at the Sandy Hook Elementary School shooting in Newtown, Connecticut on December 14, 2012 in Washington, DC.
– Stories about Connecticut shooter Adam Lanza have a familiar theme: He was a smart, quiet, polite kid who was was socially awkward and gave no sign this might happen. Samples of coverage about the 20-year-old, who attended the same elementary school where the rampage took place: Hartford Courant: Ex-classmate Kateleen Soy recalls him as "painfully shy" and a "little hard to talk to," but adds, "I wanted people to know he wasn't always a monster. He became one, but he wasn't always that way." Another, Andrew Lapple, recalls: "He was always carrying around his laptop holding onto it real tight. He walked down the halls against the wall almost like he was afraid of people. He was definitely kind of strange but you'd never think he'd do something like this." Associated Press: "Family and friends remember Adam Lanza as many things—intelligent, nerdy, goth, remote, thin." AP says police officials think he might have had some kind of personality disorder. Ex-classmate Joshua Milas from Newtown High School: "We would hang out, and he was a good kid. He was smart. He was probably one of the smartest kids I know. He was probably a genius." Danbury News-Times: "A woman who lives near the Lanza family said Lanza was a 'reserved' and shy youth who appeared to be 'troubled.'" Reuters: Tim Arnone, who went to school with Lanza at Sandy Hook Elementary and at Newtown High School, said they were in the AV-club together, "the nerdiest club in the school." He said Lanza was "driven hard" by his parents, who divorced a few years ago, to do well in school. His mom in particular "pushed him really hard to be smarter and work harder in school." A local landscaper adds that she was an avid gun collector who took him target shooting.