Adam Lanza's barber said cutting the 20-year-old's hair was a difficult and "uncomfortable" process, while also mentioning one of the first eyewitness accounts in the investigation about Lanza's relationship with his mother.

Lanza, the gunman responsible for killing 26 people at an elementary school in Connecticut on Dec. 14 before taking his own life, would get a haircut at Robert Anthony's Hair Salon every six weeks without speaking or looking at anyone at the barbershop and was always accompanied by his mother, stylists at the salon in his hometown said, cited by The Huffington Post.

He stopped coming into the shop a few years ago but when he did come in, cutting Lanza's hair "was a very long half an hour. It was a very uncomfortable situation," stylist Diane Harty said. She added that she never heard Lanza speak during his visits.

Bob Skuba, who has run the salon for the last 13 years with his mother and sister, said Lanza "would sit with his head straight down, his eyes adrift, never making eye contact," in the words of CNN. Skuba also said that Lanza would not say a word during his visits to the shop and when Skuba would ask the teenager generic questions about school and his daily life, his mother, Nancy, would interject and answer for her son.

"It's just weird that I actually touched him. That's the worst part about it -- that he was in one of our chairs," Shuba said. "I'd try to joke with him. He wouldn't even look at me."

Nancy would answer for Adam whether or not he liked the haircut and when Skuba would tell him his haircut is done and that he could get up from the seat, Adam sat stoically until his mother told him to get up.

"I would say, 'Adam, come on.' He wouldn't move," Skuba said. "And his mother would have to say, 'Adam, come on, he's ready.' It was like I was invisible."

Investigation is still continuing into Adam's motive for killing children and adults at the Sandy Hook Elementary School in Newton, Conn.

Others who knew Adam also described his behavior following the Newton school shooting. A former classmate in his 10th grade honors English class, Olivia DeVivo, said Adam "was always very nervous and socially awkward." She told ABC News that "he didn't really want to be spoken to" and that when teachers would call on him "it appeared physically difficult for him to speak."

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Adam lanza, Newton school shooting, Sandy hook elementary school