A lifetime sex offender is in the Butler County Prison on charges he failed to notify authorities of a temporary address.

Designated a sexually violent predator, 35-year-old James E. Metlak also did not register his Facebook account as required by Pennsylvania’s version of Megan’s Law, authorities said.

State police Friday arrested Metlak on a pair of felony charges after they said a spot check revealed the violations.

Metlak, like any other convicted sex offender, is required by Megan’s Law to notify police within 48 hours of moving, changing jobs or enrolling in school.

However, Metlak is classified as a “transient” and has no permanent home. Still, he must register his general whereabouts every month.

But police last week learned that he was living in the 100 block of East North Street in Butler, an address that he failed to register with police.

Additionally, troopers learned that Metlak was using a Facebook account under a fictitious name. State law requires that sex offenders register Internet and social media site names.

District Judge Lewis Stoughton on Friday arraigned Metlak on two counts of failing to comply with registration of sexual offenders requirements, a second-degree felony.

He was placed in the prison on $30,000 bail, following arraignment.

According to county court records, Metlak was designated a sexually violent predator after he assaulted his then-estranged wife in 2006 in Butler.

In an unrelated case following the attack, Metlak was caught with child pornography that he downloaded on a computer, Butler police said.

In 2007, he pleaded guilty to indecent assault and possessing child pornography, and was sentenced to 22 to 44 months in state prison, followed by 8 years of probation.