AP: Shooting Suspect Believed to Suffer From 'Personality Disorder' and Be 'Somewhat Autistic', Says Sibling

This 2005 photo reportedly shows shooter Adam Lanza

WASHINGTON (TheBlaze/AP) -- A law enforcement official says that the 20-year-old suspect in the Connecticut school shootings killed his mother at their home Friday and then drove his mother's car to the school where he went on a deadly rampage.

The 20-year-old killer, identified as Adam Lanza, committed suicide at the school, bringing the death toll to 28, authorities said.

In an interview with ABC News, a relative said Adam was "obviously not well."

Another friend said he "was not connected with the other kids." Further, other family friends described Adam as a troubled young man. The first image of Adam Lanza was released late Friday, though the photo (pictured above) is from 2005.

The Associated Press initially reported that Adam Lanza's mother, Nancy, was a teacher at the school. However, late Friday night the AP reported that "at least one parent said Lanza's mother was a substitute teacher there" but her name did not appear on a staff list.

The law enforcement official who spoke to the AP said investigators were unable to establish any connection between the mother and the school. ABC News reported that the gunman’s mother was a teacher’s aide at school and not a teacher. The source of the confusion is unclear at this point, but there are many unanswered questions that remain.

Meanwhile, in New Jersey, Adam Lanza's older brother, Ryan, 24, of Hoboken, N.J., was being questioned by law enforcement in New Jersey and was extremely cooperative, said a second law enforcement official who was briefed on the investigation. Ryan Lanza is not believed to have any involvement and is not under arrest or in custody, but investigators were still searching his computers and phone records, said the second official.

Ryan Lanza told law enforcement that his brother was believed to suffer from a personality disorder and be "somewhat autistic" and lived with the mother in Connecticut, the second official added.

The rampage, coming less than two weeks before Christmas, was the nation's second-deadliest school shooting, exceeded only by the Virginia Tech massacre that claimed 33 lives in 2007.

Earlier, a law enforcement official mistakenly transposed the brothers' first names.

The officials spoke on condition of anonymity because they official were not authorized to speak publicly about the developing investigation.

According to the first official, the suspect drove to the scene of the shootings in his mother's car. Three guns were found at the scene - a Glock and a Sig Sauer, both pistols - and a .223-caliber rifle. The rifle was recovered from the back of a car at the school. The two pistols were recovered from inside the school.

"Evil visited this community today and it's too early to speak of recovery, but each parent, each sibling, each member of the family has to understand that Connecticut - we're all in this together. We'll do whatever we can to overcome this event," Gov. Dannel Malloy said.

NEWTOWN, CT - DECEMBER 14: Emergency workers stand in front of the Sandy Hook School December 14, 2012 in Newtown, Connecticut. Credit: Getty Images

Distraught leave the fire station after hearing news of their loved ones from officials December 14, 2012 in Newtown, Connecticut. A young gunman slaughtered 20 small children and six teachers on Friday after walking into a school in an idyllic Connecticut town wielding at least two sophisticated firearms. Credit: AFP/Getty Images

Meanwhile, former Jersey Journal staff writer Brett Wilshe said he has spoken with Ryan Lanza of Hoboken, who told Wilshe the shooter may have had Ryan Lanza's identification.

Ryan Lanza has a Facebook page that posted updates Friday afternoon that read that "it wasn't me" and "I was at work."

One of the officials said earlier Friday that a girlfriend of one of the Lanza brothers and another friend were missing in New Jersey. Subsequently, the third official said police had talked with the girlfriend. One of the friends had to be reached in California, so it took some time.

Police shed no light on the motive for the attack. The gunman, Adam Lanza, was believed to suffer from a personality disorder and lived with his mother, said a law enforcement official who was briefed on the investigation but was not authorized to discuss it.

This story has been updated.