NEW YORK — Carl A. Weiss Jr. was 3 months old when his father died in Baton Rouge, La. The cause, his mother would later tell him cryptically, was a fatal firearms accident. He was not to know the truth. Indeed, by then, a son of a prosperous family, he had been whisked far away to France to shield him from what had really happened to his father on the night of Sept. 8, 1935.

The boy would not remain clueless for long, though. When he was 10, Carl Jr. stumbled across a full-page painting by John McCrady in Life magazine, one in a series of dramatic scenes from 20th-century American history.


The painting depicted a wounded Huey P. Long, Louisiana’s US senator and former governor, clutching his stomach with his bloodied left hand moments after his bodyguards had machine-gunned his purported assassin, a slight, bespectacled, white-coated 28-year-old man whose bullet-riddled body had slumped to the marble floor.

Young Carl was stunned to discover that the man portrayed as the killer was identified as his father, Dr. Carl A. Weiss.

Dr. Weiss Jr. would go on to learn a great deal about the senator and his father: that Long — who had seized near-dictatorial power to become what President Franklin D. Roosevelt branded as the most dangerous man in America — lingered 31 hours before he died of a single bullet wound; that his father died instantly, his body perforated with 61 bullet holes; and that his father — an antagonist of the Long regime but by most accounts an unlikely murderer — was just as rapidly convicted in the court of public opinion as the assassin.

Dr. Weiss Jr.’s surprise encounter with the past proved to be a turning point in his life.

Skeptical of the official account of the assassination, he would wage a tireless campaign to prove it wrong — to work with private investigators in the hope of exonerating his father. Propelled by revelations in several books, the effort led to the exhumation of his father’s body and a State Police examination of what little physical evidence had survived.


But Dr. Weiss Jr.’s mission to exonerate his father was never completed. He died of congestive heart failure Aug. 1 in Palm Beach Gardens, Fla., his son, Dr. Carl A. Weiss III, said. He was 84.

Carl Austin Weiss Jr. was born June 7, 1935, in Baton Rouge to Dr. Carl and Yvonne (Pavy) Weiss. (His father, too, was the son of a doctor.) After moving to Paris, where Carl Sr. had once briefly worked at the American Hospital, Carl Jr. grew up there, until the Nazi invasion in 1940, when he and his mother left on the last liner to New York. She later remarried, earned a doctorate, and became head librarian at Farmingdale High School on Long Island.

In Baton Rouge in the early 1930s, the Weiss and Pavy families had been known as antagonists of Long, and by 1935 was viewed as a potential challenger to Roosevelt for the 1936 Democratic nomination and as a possible third-party candidate in the coming general election.

The Kingfish, as Long proudly called himself (after a scheming character in the radio comedy show “Amos ‘n’ Andy”), advocated a “share the wealth” agenda that some historians believe nudged Roosevelt to support Social Security and other New Deal programs to meet the challenges posed by the Depression. (Long was often short on specific remedies, however; during one Senate filibuster he famously said, “I am beginning to be convinced by the logic of my own argument.”)


Carl Jr. was only 15 when he enrolled at the College of the Holy Cross in Worcester, Mass. He graduated in 1954 and earned his medical degree from Columbia University College of Physicians and Surgeons. He performed his residency at St. Vincent’s Hospital in New York and trained as an orthopedist at Bellevue Hospital, where his father had been a resident in the 1920s. Becoming an orthopedic surgeon, Dr. Weiss Jr. ran an orthopedic rehabilitation center in Garden City on Long Island.

Dr. Weiss Jr. served as an Air Force captain in Texas and was an amateur pilot.

After he retired, he and his wife, Mary Jane (LaCorte) Weiss, lived in Westhampton, N.Y., and Palm Beach Gardens. After his wife died in 2015, Dr. Weiss Jr. lived in Florida full-time. In addition to their son, he leaves two daughters, Christina Weiss Terranova and Gretchen Weiss Dubit; and eight grandchildren.

Dr. Weiss Jr. was not the first to seek to clear his family’s name in the Long assassination; his uncle, Thomas, had made the effort earlier. He had been reluctant to join his uncle.

The official version of events on that night in 1935 has it that one man, Dr. Weiss Jr.’s father, shot Long with one bullet from one gun after confronting Long at the Capitol, incensed that a bill before the Legislature would gerrymander his father-in-law, Benjamin Henry Pavy, out of a judgeship.


This account was supported by T. Harry Williams in his largely sympathetic Pulitzer Prize-winning biography “Huey Long” (1969). In the book, Williams was unequivocal in identifying the assassin as Weiss Sr., portraying him as a sincere and idealistic young man who was willing to martyr himself after agonizing “over the evils that he believed Huey Long was inflicting on his class and his state.”

But Dr. Weiss Jr.’s doubts were stirred by several subsequent books on the Long assassination, beginning with “Requiem for a Kingfish” (1986) by Ed Reed. Another was “Accident and Deception” (1999) by Donald A. Pavy, a nephew of Judge Pavy and a first cousin of Dr. Weiss Jr.’s wife.

The counternarrative asserts that the doctor had only punched Long, that the bodyguards had overreacted, and that Long was actually killed in the fusillade of their bullets. The guards were said to have then covered up their reckless response by pinning the death on Weiss Sr.

“In his heart he knew the allegations weren’t true,” Carl Weiss III said of his father in a telephone interview. “The one-man, one-gun, one-bullet is not what occurred.”

Dr. Weiss Jr. ultimately cooperated with James E. Starrs, a forensic scientist at George Washington University, who tracked down Weiss Sr.’s revolver and a single spent bullet. (It was not unusual for Baton Rouge doctors making late-night house calls to be armed.)


They were found in a safe-deposit box belonging to the daughter of Louisiana’s former top police official. Dr. Weiss Jr. joined the State Police in successfully suing to review the records and test fire the gun. The police concluded that the bullet — if it was, indeed, the one that had killed Long — had not come from Weiss’s revolver.

Long’s clothes were also examined, and here the tearing of the material and the residue left on it indicated that Long had been shot at point-blank range. That undercut at least one theory — that Long was killed by a ricocheting bullet fired by a bodyguard.

Dr. Weiss Jr. granted Starrs permission to exhume his father’s remains from a Baton Rouge cemetery in 1991 in the hope that tissue residue or evidence of the bullets’ trajectory might shed some light on the case. Starrs concluded that there were “grave and persuasive doubts” that the doctor was the assassin.

But no official investigation ever included an autopsy on Long, who is buried on the grounds of the state Capitol. Such an examination might have confirmed the source of the bullet or bullets that killed him.

“They exhumed the wrong body,” Weiss III said.