NEW YORK — A federal judge ruled Friday that the former CEO of Abercrombie & Fitch is not competent to stand trial on sex trafficking charges and ordered him hospitalized to see if his mental condition improves.

Michael Jeffries’ lawyers sought the ruling last month, writing in a letter filed in a New York federal court that the 80-year-old requires around-the-clock care because he has Alzheimer’s disease, Lewy body dementia and the “residual effects of a traumatic brain injury.”

The defense, as well as prosecutors, requested that Jeffries be placed in federal Bureau of Prisons custody so he can be hospitalized and receive treatment that might allow his criminal case to proceed.

“The court finds by a preponderance of the evidence that the defendant is presently suffering from a mental disease or defect rendering him mentally incompetent to the extent that he is unable to understand the nature and consequences of the proceedings against him or to assist properly in his defense,” Judge Nusrat Choudhury wrote in his decision.

He directed the Attorney General’s office to place Jeffries in a hospital for up to four months.

Jeffries has been free on $10 million bond since pleading not guilty in October to federal charges of sex trafficking and interstate prostitution.

Prosecutors say he, his romantic partner and a third man used the promise of modeling jobs to lure men to drug-fueled sex parties in New York City, the Hamptons and other locations. The charges announced in October echo sexual misconduct accusations made in a civil case and the media in recent years.

In their letter, Jeffries’ lawyers said at least four medical professionals concluded that their client’s cognitive issues are “progressive and incurable” and that he will not “regain his competency and cannot be restored to competency in the future.”

Jeffries left Abercrombie in 2014 after more than two decades at the helm. His partner, Matthew Smith, has also pleaded not guilty and remains out on bond, as has their co-defendant, James Jacobson.