AUSTIN, TEXAS -- For years, bombastic far-right conspiracy theorist Alex Jones ranted to his millions of followers that the 2012 Sandy Hook Elementary School shooting was a hoax, that children weren't killed and that parents were crisis actors in an elaborate ruse to force gun control.

Under oath and facing a jury that could hit him with US$150 million or more in damages for his false claims, Jones said Wednesday he now realizes that was irresponsible and believes that what happened in the deadliest school shooting in American history was "100 per cent real."

Jones' public contrition came on the final day of testimony in a two-week defamation lawsuit against him and his Austin-based media company, Free Speech Systems, brought by Neil Heslin and Scarlett Lewis, the parents of 6-year-old Jesse Lewis. Their son was a first grader who was among the 20 students and six teachers killed at the school in Newtown, Connecticut, on Dec. 14, 2012.

"I unintentionally took part in things that did hurt these people's feelings," said Jones, who also acknowledged raising conspiracy claims about other mass tragedies, from the Oklahoma City and Boston Marathon bombings to the mass shootings in Las Vegas and Parkland, Florida, "and I'm sorry for that."

But an apology isn't enough for Heslin and Lewis. They said Jones and the media empire he controls and used to spread his false assertions must be held accountable.

"Alex started this fight," Heslin said, "and I'll finish this fight."

The parents testified Tuesday about a decade of trauma, inflicted first by the murder of their son and what followed: gun shots fired at a home, online and telephone threats, and harassment on the street by strangers, all fueled by Jones and his conspiracy theory spread to his followers via his website Infowars.

A forensic psychiatrist testified the parents suffer from "complex post-traumatic stress disorder" inflicted by ongoing trauma, similar to what might be experienced by a soldier at war or a child abuse victim.

At one point in her testimony, Lewis looked directly at Jones, who was sitting barely 10 feet away.

"It seems so incredible to me that we have to do this -- that we have to implore you, to punish you -- to get you to stop lying," Lewis told Jones.

Courts in Texas and Connecticut have already found Jones liable for defamation for his portrayal of the Sandy Hook massacre as a hoax involving actors aimed at increasing gun control.

Now, Heslin and Lewis are asking the jury in Austin for US$150 million in compensation for defamation and intentional infliction of emotional distress. They will also ask the jury to assess additional punitive damages.

Jurors began considering damages Wednesday. Once they determine whether Jones should pay the parents compensation for defamation and emotional distress, it must then decide if he must also pay punitive damages. That portion will involve a separate mini-trial with Jones and economists testifying to his and his company's net worth.

Jones' attorney asked the jury to limit damages to US$8 -- one dollar for each of the compensation charges they are considering -- and Jones himself said any award over US$2 million "would sink us."

At the end of Jones' testimony, Mark Bankston, an attorney for the family, pulled a crumpled dollar bill out of his pocket, showed it to Jones, and put it down in front of the parents.

"The day Sandy Hook happened, Alex Jones planted a seed of misinformation that lasted a decade," parents' attorney Kyle Farrar told the jury in closing arguments. "And he just watered that seed over and over until it bore fruit: cruelty and money."

During his testimony, Jones said he's tried in the past to back off the hoax claims, but "they (the media) won't let me take it back."

Jones -- who has been banned from major social media platforms for hate speech and abusive behavior -- has portrayed the lawsuit as an attack on his First Amendment rights and complained that he's been "typecast as someone that runs around talking about Sandy Hook, makes money off Sandy Hook, is obsessed by Sandy Hook."

Eight days of testimony included videos of Jones and Infowars employees talking about the Sandy Hook conspiracy and even mocking Heslin's description in a 2017 television interview that he'd held his dead son Jesse's body "with a bullet hole through his head." Heslin described that moment with his dead son to the jury.

Jones was the only witness to testify in his defense. And he came under withering attack from the plaintiffs attorneys under cross examination, as they reviewed Jones' own video claims about Sandy Hook over the years, and accused him of lying and trying to hide evidence, including text messages and emails about Sandy Hook. It also included internal emails sent by an Infowars employee that said "this Sandy Hook stuff is killing us."

At one point, Jones was told that his attorneys had mistakenly sent Bankston the last two years' worth of texts from Jones' cellphone.

And shortly after Jones declared "I don't use email," Jones was shown one that came from his address, and another one from an Infowars business officer telling Jones that the company had earned US$800,000 gross in selling its products in a single day, which would amount to nearly US$300 million in a year.

Jones has already tried to protect Free Speech Systems financially. The company filed for federal bankruptcy protection last week. Sandy Hook families have separately sued Jones over his financial claims, arguing that the company is trying to protect millions owned by Jones and his family through shell entities.

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Associated Press writer Paul J. Weber contributed to this report.