LOS ANGELES (AP) _ A Mexican national held here on drug charges helped a drug overlord arrested in the 1985 torture slaying of an American drug agent flee Mexico after the killing, according to court documents unsealed Monday.

The overlord, Rafael Caro Quintero left Mexico for Costa Rica after the death of U.S. Drug Enforcement Administration agent Enrique Camarena Salazar, according to a sworn statement from DEA agent Douglas W. Kuehl.

The document was unsealed following a court appearance by Jesus Felix- Gutierrez, 38, a native of Mexico.

He and nephew Carlos Felix, 26, were charged with conspiracy and with possession of cocaine with intent to distribute. Both were arrested Wednesday.

Felix-Gutierrez also is charged with two passport violations, said Assistant U.S. Attorney Jimmy Gurule.

''Following the murder of Camarena in Guadalajara, Mexico, in February 1985, Rafael Caro Quintero fled to Costa Rica with the help of Jesus Felix,'' the affidavit said.

''Caro Quintero moved into La Quinta, a ranch purchased by Jesus Felix.''

Caro Quintero is a Mexican drug overlord now jailed in Mexico for the killing of Camarena, the affidavit said.

The affidavit documented the purchase of the ranch and other property in Costa Rica and the United States, allegedly with drug money.

The affidavit also documented a number of telephone calls between Caro Quintero and Felix-Gutierrez and his associates in the Los Angeles area.

At Monday's hearing before federal Magistrate James Penne, the two suspects were informed of the charges against them.

Arguments on whether they should be freed on bail were put over until Wednesday at the request of defense attorneys, and a preliminary hearing was set for Jan. 13.

The affidavit by the DEA agent recounts an investigation of alleged drug trafficking in Southern California, Mexico and Costa Rica by Felix-Gutierre z, and details evidence that the agent says links his nephew to the operation.

Caro Quintero also had extensive ties with the operation, according to the affadavit.

The affidavit released in Los Angeles named two other men who allegedly took part in the drug smuggling.

One of those men, Arturo de la Torre, is in federal custody in Honolulu on charges of possessing cocaine and marijuana with the intent to distribute and conspiracy to possess the drugs with intent to distribute, Gurule said.

The other man, Jaime Castenada, remains at large, he said.