(Reuters) — On Aug. 14, Zurich Insurance Group Ltd. Chairman Josef Ackermann received financial chief Pierre Wauthier and head of investor relations James Quin at his office overlooking Lake Zurich to finalize the company's second-quarter results, due for release the next day.

Most of the legwork was done. Chief Executive Martin Senn, promoted to the top job in 2010, had already taped a video presentation for shareholders. Speaker notes and other material prepared to help investors understand the earnings had also been completed, according to sources in the company.

But in a last-ditch move, Mr. Ackermann said the company should signal its lack of progress with some of its three-year business targets set in 2010.

Mr. Wauthier disagreed, according to one source, arguing that Zurich should say it was progressing to "deliver" on the goals.

Mr. Ackermann, a veteran of the hard-charging world of investment banking, prevailed, and the insurer told investors it was progressing "towards" the targets. That, along with a 17% drop in first-half net profit, prompted a near 4% fall in the share price.

The brief disagreement came less than two weeks before Mr. Wauthier killed himself, an event that has shaken Zurich Insurance, prompted Mr. Ackermann to resign, and focused attention on the former investment banker's management style.

In a typed suicide note, addressed "To whom it may concern," Mr. Wauthier described himself as demoralized after months of a new, more aggressive tone at Zurich under Mr. Ackermann, according to several people who have seen the letter.

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Mr. Wauthier cited the encounter over the targets in the note.

Zurich has celebrated a "boring" image in the years since turning around from a near-collapse in 2002 following a ill-judged expansion strategy. Mr. Ackermann's blunt style was a huge change for Mr. Wauthier, used to a more consensual culture.

"He clearly had been feeling it for a very long time," a source who has seen Mr. Wauthier's note told Reuters.

Mr. Ackermann declined to comment. Through a company spokeswoman, investor relations head Mr. Quin declined to comment.

Zurich said there was no evidence of a dispute between the two men over the company's outlook, and both the board and executive committee agreed on the company's message.

The insurer has launched an internal review to see whether Mr. Wauthier, a 53 year-old dual French-British citizen, had been put under undue strain but is still working on the details, a spokeswoman said.

People close to Mr. Ackermann acknowledged the difference of opinion over how the results should be presented, but said such debates are not unusual in a company like Zurich.

"If this was seen as unbearable pressure, then something else must have been wrong," one of these people said.

Credited with transforming Deutsche Bank A.G. into an investment banking powerhouse, Mr. Ackermann, a Swiss national, took over the chairmanship of Zurich Insurance last year, determined to shake it up.

The 65-year old was much more involved in the day-to-day running of Zurich than past chairmen, according to sources.

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Described by people familiar with his thinking as a "numbers person," Mr. Ackermann used to hold one-on-one meetings with Mr. Wauthier, an unusual move for a nonexecutive chairman, and quickly immersed himself in details of the insurer's accounts.

A failure to set aside enough money to cover claims at its German arm had hit profits last year, and weak investment returns and heavy exposure to disasters in the United States had shaken investor confidence. The company's stock was underperforming European peers, and several top-level managers had left, giving rise to talk of a brain drain, sources inside Zurich say.

Several sources say there were no outward signs of tension at the meeting on the eve of the results announcement, and Mr. Wauthier didn't appear to be distressed.

Twelve days later, his body was found at his home, a former lakeside inn outside Zurich that the Wauthier family was in the process of renovating. His wife and two children were abroad at the time. They declined to comment to Reuters.

Colleagues and investors who met Mr. Wauthier in meetings in London days before he killed himself did not detect any warning signs. He responded to emails as recently as the day before his death, according to company sources.