NEW YORK (CNN/Money) - Tyco International Inc. revealed late Thursday the departure of Chief Financial Officer Mark Swartz and General Counsel Irving Gutin.

Swartz, who was appointed CFO of Tyco in 1995, has decided to leave the company, while Gutin is retiring. Both will stay in their present roles until Tyco finds their replacements, Chairman and CEO Edward Breen said in a letter to employees Thursday.

In his letter, Breen called for an absolute commitment to integrity and trustworthiness throughout the corporation. Breen was appointed on July 25 to replace Dennis Kozlowski, who resigned in June before being indicted for sales tax evasion.

"In order to achieve these goals, I need to be sure we have in place the management team that will be working with me over the long haul to concentrate on the challenges and opportunities that lie ahead, and therefore I plan to add key people to my team in the near future," Breen said.

The Tyco CEO also announced the appointment of Michael Useem, professor of management at the University of Pennsylvania's Wharton School, to advise on corporate governance practices.

Swartz had close ties to Tyco's disgraced former chairman and his resignation has long been expected. Both Swartz and Kozlowski oversaw Tyco's rapid acquisition pace during the 1990s that cost more than $60 billion.

Gutin was appointed in June on a temporary basis to replace fired general counsel Mark Belnick.

Shares of Tyco (TYC: Research, Estimates), which closed at $12.81 Thursday, dropped to $12.04 in after hours trading on Instinet.