A friend of US gunman Elliot Rodger's family said the 22-year-old had not been diagnosed with Asperger's syndrome - contrary to reports - but his parents suspected he was on the spectrum.
Simon Astaire, a Hollywood talent agent and media advisor, told the Los Angeles Times Rodger's had been in therapy for years and had no friends.
The gunman, who killed six people before apparently shooting himself, played the video game World of Warcraft but was not "obsessed with guns or war games", Mr Astaire said.
He added that Rodger's "was fundamentally withdrawn", shy and did not often look people in the eye.
"The guy on the video [posted online by Rodger's before the shootings] was much more confident, that is a guy I never met," Mr Astaire told the newspaper.
More top news
Detectives investigating the abduction and rape of a 14-year-old girl as she walked to school have released a description of the offenders.
His widow wrote about his struggles with the little-known Lewy body disease in a neurological journal.
Police have revealed a pair of sandals they have had made similar to the pair Ben is thought to have been wearing when he disappeared