Conrad Hilton, the 20-year-old brother of Paris Hilton, is facing a possible six months jail time for assaulting flight attendants during his trip to London.

This, after the young Hilton agreed to plead guilty to the charges of assaulting flight attendants and threatening to kill crew members.

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The offense carries a maximum sentence of six months in jail, 12 months of probation, and a fine of US$5,000.

Prosecutors, however, said they would ask a judge to give Hilton only probation because of the deal.

The US attorney's office in Los Angeles said Conrad signed the agreement Tuesday and will appear in court Thursday to officially plead guilty to the misdemeanor.

Hilton's lawyer Robert Shapiro earlier said the behavior of his client during the Los Angeles-London flight may have been the effects of a sleeping pill.

The Federal Bureau of Investigation said Hilton was onboard a plane for the 10-hour flight last July 31, 2014 when the assaulting occurred.

Hilton allegedly ignored instructions to keep his seat belt fastened and instead began pacing the aisle as the aircraft ascended.

When one of the flight attendants told him to settle down to his seat, Hilton launched a series of tirades that scare some of the children aboard the plane.

"He threatened to kill several flight attendants and a co-pilot, and threatened to get them fired," the affidavit released by the FBI said.

"I could get you all fired in five minutes. I know your boss," Hilton said in one of the document's few quotes that didn't include an expletive.

The FBI affidavit further revealed that Hilton went to a lower deck restroom to smoke marijuana because he was angry over the breakup with a girlfriend.

The odor of the marijuana wafted out, filling the lower deck, the FBI document said. 

TagsConrad Hilton, Paris Hilton, Conrad Hilton Assault