The obituary yesterday about Jean G. Ravenscroft incorrectly summarized her education. She received her bachelor's degree from Ohio State University. The obituary also omitted one of her survivors, her brother, Paul F. Graham of Sanford, N.C. (Published 10/23/92)

Jim Garrison, 71, a former New Orleans district attorney and Louisiana state judge whose theories on the assassination of President Kennedy were the basis of the controversial movie "JFK," died Oct. 21 at his home in New Orleans.

The cause of death was not reported, but news agencies said Mr. Garrison had heart ailments. He had been in declining health for the past year.

Mr. Garrison, a former Army pilot who flew combat missions in World War II and later served as an FBI agent, gained a reputation as a flamboyant and hard-hitting prosecutor in the early 1960s after winning an upset electoral victory to become district attorney of New Orleans.

In 1973, while still serving as district attorney, Mr. Garrison successfully defended himself against federal charges that he had taken bribes to protect pinball operators. He lost his bid for reelection as district attorney in 1974, and he later lost a bid for a seat on Louisiana's Supreme Court.

But in 1978 he was elected to Louisiana's 4th Circuit Court of Appeals. He served on the bench until last year, when he reached the mandatory retirement age of 70.

Mr. Garrison will be remembered, however, for his claims that President Kennedy was killed on Nov. 22, 1963, in Dallas as the result of a conspiracy carried out by the CIA to keep the war going in Vietnam. He spent years attacking the work of the presidential commission headed by Chief Justice Earl Warren that gave the official report of the tragedy.

The Warren Commission found that Lee Harvey Oswald acted alone when he killed the president and that Jack Ruby, a Dallas nightclub owner, had acted alone when he in turn gunned down Oswald in the Dallas jail two days after the assassination.

The subject has tantalized many Americans since the assassination occurred, and polls show that a majority of citizens believe that there is more to the story than the Warren Commission reported. Many questions have been raised by students of the assassination, many of whom believe that there was a conspiracy of some sort. But none argues that Mr. Garrison uncovered it.

In 1969, Mr. Garrison prosecuted a New Orleans businessman named Clay Shaw on charges of taking part in an alleged CIA plot. Highlights included the refusal of several witnesses to testify to events they had described earlier to Mr. Garrison's investigators.

One witness, a psychologist, told the jury that he regularly took his daughter's fingerprints to assure himself that conspirators had not replaced her with a look-alike spy. Another witness had been hypnotized. In the end, the jury took less than an hour to find in Shaw's favor.

Undeterred by this setback, Mr. Garrison elaborated his conspiracy views in three books, the last of which, "On the Trail of the Assassins," formed the basis for "JFK," the Oliver Stone film starring Kevin Costner in the role of Mr. Garrison and Mr. Garrison himself in the role of Earl Warren.

Critics attacked the film for using old film clips and other "docudrama" techniques to present as fact a view in which virtually the entire government is part of a plan to kill Kennedy. They found it particularly ironic that Chief Justice Warren, a figure held in great esteem, was played by a man whom many regarded as a self-promoting fraud.

Mr. Garrison was born in Denison, Iowa, and reared in New Orleans. After World War II service in the Army Air Forces as the pilot of low-flying observer planes in France and Germany, he went to Tulane University, where he received a law degree. After law school, he was an FBI agent in Seattle.

In the 1950s, Mr. Garrison returned to New Orleans and established a law practice. He ran unsuccessfully for a judgeship in 1960 but gained public office two years later when he became district attorney.

Mr. Garrison is survived by his wife, Leah Elizabeth Ziegler Garrison; five children; and a grandchild.

ROBERT L. POWELL

Businessman

Robert L. Powell, 64, the founder and president of Powell-Pendergraph Inc., a data equipment company in Gaithersburg, was killed Oct. 19 when the twin-engined Beechcraft Baron airplane he was flying crashed while approaching the airport in Worcester, Mass.

Richard Shorey, 39, of Great Neck, N.Y., the only passenger on the airplane and a business associate of Mr. Powell's, also was killed.

A spokesman for the Federal Aviation Administration said the cause of the crash was under investigation.

Mr. Powell, a resident of Germantown who was on a business trip when the crash occurred, was born in Philadephia. He served in the Navy as a young man, and he attended Ohio State University.

In the 1950s, he went to work for Bartlett & Associates, a manufacturer's representative in the electronics field in Berwyn, Pa. He was transferred to the Washington area in the early 1960s, and he founded his own company about 1970.

Mr. Powell was a ham radio operator and a horseman as well as a pilot. He was a member of the National Rifle Association and the Bonanza Society, which is a group of aircraft owners, and a former member of the Civil Air Patrol.

His marriage to Harriet Powell ended in divorce.

Survivors include his wife, Sandra A. Powell of Germantown; four children by his first marriage, Douglas Powell of Kensington, Andrew and Robert Powell, both of Rockville, and Lynne Powell of Gaithersburg; two stepchildren, Jeffrey S. Wallace of Conshohocken, Pa., and Jennifer Alba of Lancaster, Pa.; a brother, Samuel Powell of Essex, Conn.; and two grandchildren.

ARNOLD GRAY OAKES

Data Specialist

Arnold Gray Oakes, 57, an official of the National Aeronautics and Space Administration who specialized in managing data received from satellites, died of cancer Oct. 19 at Holy Cross Hospital.

Mr. Oakes, who lived in Aspen Hill, was born in North Woodstock, N.H. He graduated from the University of New Hampshire.

From 1961 until moving to this area in 1970, he worked at the Smithsonian Institution's astrophysical observatories in South Africa and Peru. Since 1970, he had worked at the Goddard Space Flight Center.

His work there included the processing, quality control, validating and archiving of data received from satellites. He also was the chief administrator of a U.S.-Russian project to monitor the Earth's ozone layer, and in that capacity had visited Russia several times.

Mr. Oakes was a volunteer and vice chairman of the board of the NASA Federal Credit Union.

He was a trout fisherman and was rebuilding his family home in the White Mountains of New Hampshire.

His marriage to the former Carol Quimby ended in divorce.

Survivors include his wife, Gail Oakes of Aspen Hill; two children from his first marriage, Jeff Oakes of St. Louis and Cathy Despres of Fredericksburg; two stepchildren, Phil Ehr of Rockville and Jodi Bochenek of Ellicott City; a brother, Winslow Oakes of Sacramento, Calif.; and three grandchildren.

JEAN G. RAVENSCROFT

Mathematician

Jean G. Ravenscroft, 73, a mathematician who had worked in this area for Raytheon Autometrics and Ensco and taught at American University, died of cancer Oct. 19 at her home in Bath, Maine.

Mrs. Ravenscroft was born in Columbus, Ohio. She received a bachelor's degree and a master's degree in mathematics from the University of Maine.

She lived and worked in this area from 1962 until 1979, when she returned to Maine and taught at the University of Southern Maine.

Her marriage to Robert T. Hart ended in divorce.

Survivors include her husband of 31 years, Lincoln T. Ravenscroft Jr. of Bath; two children from her first marriage, Robin H. Pierce of Chantilly and David E. Hart of Falls Church; and a grandchild.

IRENE 'ARGY' SAFFOS

Homemaker

Irene "Argy" Saffos, 73, a Silver Spring homemaker, died Oct. 20 at Holy Cross Hospital after a heart attack.

Mrs. Saffos was born in Steubenville, Ohio. She moved to this area about 1940.

Survivors include her husband, Nicholas Saffos of Silver Spring; four children, Constantine Saffos of Harwood, Md., Theodore Saffos of Fredericksburg, Va., Terry Stayeas of Olney and Betsy Cizek of Davidsonville, Md.; and eight grandchildren.