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Adam Lee Brown, a registered sex offender arrested Sunday for allegedly attacking a boy in a fast food restaurant restroom, was convicted of sexually assaulting children in Roseburg in the early 1990s.

, 49, was on parole and under Multnomah County supervision after serving 11 years in state prison for a notorious series of sexual assaults against children. Douglas County prosecutors said he tried to kill by trying to infect them with the HIV virus, which he carries.

Brown, barred from frequenting places where children regularly congregate as a registered sex offender, is scheduled for arraignment Monday afternoon in Multnomah County Court in connection with a sexual assault and stabbing Sunday afternoon in Northeast Portland.

Brown is

, first-degree kidnapping, first-degree arson, coercion, furnishing false information to a police officer and four counts of first-degree assault. He is being held under a $2 million bond.

Brown, whose parole expires in 2020, reportedly

before locking the door.

said the Southwest Portland man attempted to sexually assault the boy, who fought back. During the struggle, Brown stabbed the boy several times, police said, causing injuries that could have been life-threatening. The two did not know each other.

Hearing the boy's cries, the boy's father tried to force open the locked door until a restaurant manager opened it with a key. Brown shoved the child out of the bathroom and locked the door again. Restaurant patrons held the door closed until police arrived at the scene.

After police evacuated the restaurant, patrol officers began to speak to the barricaded sex offender, who claimed to have a gun.

At 4:30 p.m., after more than two hours of negotiations with crisis negotiators, Brown walked out of the restaurant and surrendered to police without incident. The boy was taken to a Portland hospital and underwent surgery for his injuries, said Police Bureau spokesman Sgt. Pete Simpson.

Brown was arrested and taken to the Multnomah County jail. They recovered a knife but no gun was found, Simpson said. In addition to the new charges, Brown was also wanted for an outstanding parole violation warrant.

"The monsters that our kids dream about aren't as bad as the real ones," said Simpson. A father himself, Simpson said before Sunday, he allowed his 9-year-old to walk unaccompanied to the bathroom in public places. After Brown's arrest, Simpson said his family will handle things differently.

"Yes, they're rare incidents and they don't happen often but it's one incident like that that will change behavior," he said.

Predatory Sex Offender Adam Lee Brown 5 Gallery: Predatory Sex Offender Adam Lee Brown

In the 1990s cases in Douglas County, Brown, a former Marine and lay preacher, had faced 43 counts, including attempted murder and rape, but entered no contest pleas to reduced charges.

Brown pleaded not contest to three counts of sodomy and one count of recklessly endangering another. Thirty-nine other charges were dismissed after the plea and sentencing, but the state reserved the right to recharge Brown with murder, attempted murder or assault if any of 9 children alleged to have been Brown's victims in Douglas County tested positive for HIV. He was sentenced to a 16-year term in 1993,

.

At the time of his sentencing, then Douglas County deputy district attorney William Marshall -- now a judge in Roseburg -- said the sentence was sufficient to protect the public. "I am satisfied he is going to die in custody,'' Marshall said after the brief proceeding before Multnomah County district judge in December 1993.

Brown served 11 years in prison for the pre-

, having earned good time and credit for time served while awaiting trial. He was in prison from Dec. 29, 1993, until his release Oct. 5, 2004, said Liz Craig, spokeswoman for the

.

He was initially released to the supervision of Douglas County in 2004, but had been transferred to the supervision of Multnomah County in August 2010.

The Portland Wendy's restaurant remained closed Monday morning. A manager inside said it would reopen at 10 a.m.

Brown's arraignment is set for 2:30 p.m. at Multnomah County Circuit Court.