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The resulting vaccination map would allow swift intervention in neighborhoods left vulnerable to the fast-moving respiratory illness.

The trial starts this afternoon, when several hundred people are expected to queue up for immunizations at the headquarters of the Boston Public Health Commission. Each of them will get a bracelet printed with a unique identifier code. Information about the vaccine’s recipients, and the shot, will be entered into handheld devices similar to those used by delivery truck drivers.

Infectious disease specialists in Boston and elsewhere predicted that the registry approach could prove even more useful if something more sinister strikes: a bioterrorism attack or the long-feared arrival of a global flu epidemic. In such crises, the registry could be used to track who received a special vaccine or antidote to a deadly germ.

Then, in an instant, he was gone — his privileged life ended, by his own hand, with a single gunshot to the head.

No one can know exactly what Finn M. W. Caspersen, a prominent philanthropist and the heir to the Beneficial Corporation fortune, was thinking when he decided to take his life on Labor Day. Although Mr. Caspersen, 67, was battling kidney cancer, his suicide shocked his family and friends.

But Mr. Caspersen, a patron of Harvard and Princeton who gave away tens of millions of dollars to charity, apparently harbored a secret: He was suspected of dodging many millions in federal taxes. The authorities, it seemed, were closing in.

At the time of his death, investigators were building a case against Mr. Caspersen on suspicion of using secret offshore bank accounts to evade taxes.

The authorities had asserted he might have owed as much as $100 million in back taxes and fines or, possibly, even have faced prison, according to a person briefed on the investigation, who was granted anonymity because of the delicacy of the case and the events surrounding Mr. Caspersen’s death.

Whispers of some sort of tax trouble went through the crowd at Mr. Caspersen’s funeral on Tuesday. About 800 people attended the service in Morristown, N.J.

“He made everything right for so many people, and that is why this is such a tragedy,” Susan Wachter, a friend and former Beneficial board member, said of Mr. Caspersen’s death.

Mr. Caspersen’s widow, Barbara, declined to comment as did other family members. But friends and business associates struggled to come to terms with the suicide of a man many characterized as larger than life.

“I’m shocked by his death,” said Philip Richter, a former managing director at Knickerbocker, Mr. Caspersen’s private investment firm.

The precise nature of the tax investigation was unclear. What is known is that Mr. Caspersen, a longtime fixture in New Jersey political circles, had been swept up in a broad, federal crackdown on the use of offshore bank accounts by wealthy Americans. UBS, the big Swiss bank, divulged the names of nearly 300 of its American clients in February and agreed to hand over several thousand more last month.

One wealthy UBS client, Igor Olenicoff, hid an estimated $200 million in Switzerland and Liechtenstein. In 2008, he pleaded guilty to a single federal tax felony and paid $52 million in back taxes and penalties. More recently, several other UBS clients, among them a Florida yacht broker, admitted to tax evasion.

As the inquiries continue, the names of more well-to-do people are likely to come to light. Those who have hidden money offshore face a difficult choice: They have a week to turn themselves over to the Internal Revenue Service or gamble that they will not be caught. The I.R.S. is offering amnesty to those who disclose their offshore holdings by Sept. 23. After that, offenders could face criminal prosecution.

The Caspersen case centers on bank accounts in Liechtenstein, which, like Switzerland, is a leading offshore haven. The I.R.S. learned that Mr. Caspersen held an account at LGT, the private bank controlled with Liechtenstein’s royal family, according to the person close to the investigation. Liechtenstein pledged last December to disclose the names of some wealthy Americans with bank accounts there, but it was unclear if Mr. Caspersen’s name was among them or how the I.R.S. learned of any account in his name.

The questions are unlikely to end with Mr. Caspersen’s death. His family was associated with Beneficial, the consumer lending giant, for most of the 20th century. Mr. Caspersen ran the company for 20 years before selling it to Household International in 1998 for $8.6 billion.

That year Mr. Caspersen established Knickerbocker, which he named after the men-only Knickerbocker Club, on the Upper East Side, to which he belonged. At that time, Knickerbocker oversaw about $1 billion, most of which represented the Caspersen fortune.

According to the person familiar with the investigation, federal authorities recently placed liens on the personal trusts of Mr. Caspersen’s four sons, Finn M. W. Caspersen Jr., Erik M. W. Caspersen; Samuel M. W. Caspersen; and Andrew W. W. Caspersen.

Like Mr. Caspersen, his sons are graduates of Harvard Law School, where the Caspersen Room houses rare books, documents and artwork. Last year, Mr. Caspersen pledged $30 million to Harvard Law, the largest single donation in the school’s history.

Henry Christensen III, a lawyer for Mr. Caspersen’s sons, declined to comment.

People who knew Mr. Caspersen characterized him as larger than life. Lawrence E. Bathgate II, a New Jersey lawyer who is a former national Republican Party finance chairman, came to know Mr. Caspersen when Thomas H. Kean first ran for governor in 1981. He said the governor’s backers wanted to make a splash when he won but were hampered by restrictions on how much they could raise for inaugural events.

Nonetheless, Mr. Caspersen made one black-tie party memorable by arranging for an antique wooden carriage, led by four matched horses, to bring the departing governor and the incoming governor to the party at the governor’s mansion on a cold winter night in 1982. The footman was in period costume, as was the man who held four reins by the hand.

Mr. Caspersen, an accomplished equestrian, was the driver, Mr. Bathgate said.

“I was talking to Governor Kean about it a couple of days ago, and we both agreed he was a throwback to a gentlemen of a prior time,” Mr. Bathgate said.

Mr. Caspersen’s health and financial situation apparently weighed on him in recent months.

Gerald L. Holm, a longtime friend and business associate, said Mr. Caspersen had mentioned that he was being audited by the I.R.S. but that he had not gone into details.

Mr. Holm said that Mr. Caspersen was “like a second father to me.”

He said, “Finn was never the type who was going to give his innermost secrets to anybody.”

Others said Mr. Caspersen’s health had worsened in recent months. On Labor Day afternoon, Mr. Caspersen’s despair apparently overtook him, and he shot himself to death on the grounds of the Shelter Harbor Golf Club in Westerly, R.I., the seaside community where he had a summer home, according to the local police. Mr. Caspersen was a founder of the club.

Shortly before his death, Mr. Caspersen placed his estate and nearby land in Westerly on the market for $10.9 million and began to step back from various philanthropic efforts.

He unexpectedly resigned from the Dean’s Advisory Council at Harvard Law School — he was in the class of 1966 — and quit as chairman of the board of the Peddie School, the prep school in Hightstown, N.J., from which he graduated in 1959.

Police, responding to a call to check on him, found Caspersen on Sept. 7 behind an office building in the Shelter Harbor community of Westerly, Rhode Island, where he owned a home, said spokesman Edward St. Clair. He died from a single gunshot wound, the medical examiner said.

“Finn was always a gentleman and always made his resources available,” said Rhode Island state Senator Dennis Algiere, who represents the seaside region, just across the state line from Connecticut. “He was a very charitable individual. He donated a lot of time and money to various organizations in our community over the years.”

Caspersen sold consumer-finance company Beneficial to Household International Inc. in 1998 for more than $8 billion, His father, Olaus W. Caspersen, had joined Beneficial in 1920 and ran the company for 18 years. Finn Caspersen was paid almost $24 million in severance and other payments from the sale to Household, which became HSBC Finance Corp.

A graduate of Harvard Law School, Caspersen donated $30 million to the school in 2003 to help jump-start a capital campaign. He was also a graduate of Brown University.

An equestrian who specialized in carriage driving, Caspersen won three national championships and represented the U.S. in three world championships. He had been a board member of the U.S. Equestrian Team since 1982, was named president in 1990 and chairman in 1992.

No One ‘More Caring’

“I don’t think you could find someone more philanthropic or caring,” said Tucker Johnson, an equestrian and a friend of Caspersen’s, according to a statement on an equestrian Web site.

Former New Jersey Governor Thomas H. Kean said Caspersen gave away tens of millions of dollars to charity, according to the Newark Star-Ledger. While running Beneficial, Caspersen built a corporate headquarters in Peapack-Gladstone, New Jersey, the newspaper said.

Caspersen gave about $590,000 to the Republican Party between 1998 and 2001, according to the Center for Responsive Politics.

He was chairman of Knickerbocker Management, a private firm overseeing the accounting and investments of various trusts, foundations and individuals, according to a 1999 press release from the Hodson Trust, a philanthropic organization.

Caspersen was chairman of the board of trustees of the Peddie School, his high school alma mater in Hightstown, New Jersey. The school has 530 students and an endowment of $218 million, according to its Web site.

Approved after the September 11 attacks in 2001 at the request of the Bush administration, techniques such as roving wiretaps and accessing all kinds of personal records drew criticism from civil liberties groups and some lawmakers who said they were unconstitutional and violated privacy rights.