NEW YORK (CNNMoney.com) -- An independent legal firm hired by Hewlett Packard chief executive Mark Hurd revealed the latest on who was involved in the leak probe and what they knew.

Mike Holston, a lawyer from Morgan, Lewis & Bockius, the firm Hurd hired earlier this month to conduct a thorough investigation of the HP (Charts) leak probe, outlined the latest developments Friday at a press briefing at the technology giant's Palo Alto, Calif. headquarters.

The firm's investigation is not complete and it it still needs to review several documents related to the leak investigation, Holston added.

The main players:

Fred Adler, HP's IT security investigator. A member of the core investigative team assembled for the second phase of the investigation - called Kona II - that began in early 2006.

Ann Baskins, HP's general counsel. Briefed on both phases of the investigation. She was provided with updates on the second phase of the probe and a report outlining the pretexting methods used was addressed to her.

Ronald DeLia, managing director of Security Outsourcing Solutions (SOS). His firm was hired to work on both phases of the investigation. He was also a member of the team behind Kona II.

Joe Depante, private investigator and owner of Action Research Group. His firm was the subcontractor Security Outsourcing Solutions hired to assist in its investigation.

Patricia Dunn, HP's former chairman and board member. Initiated the first phase of the investigation, called Kona I, in early 2005. Hired investigative firm Security Outsourcing Solutions and was aware that the second phase of the investigation had resumed in early 2006. A report outlining the pretexting methods used in the probe was addressed to her.

Tony Gentilucci, HP's global security manager. Member of the team behind the second phase of the investigation that started after a January 2006 leak. He provided an HP employee's social security number to SOS.

Mark Hurd, HP's chief executive. He was aware of both phases of the investigation and approved the sending of a fake email to a reporter in the effort to find the leaker. He attended a meeting where he was verbally briefed on the source of the leaks, but he says he didn't read a written report that outlined the pretexting tactics used in the probe.

Kevin Hunsaker, HP senior counsel and chief ethics officer. Led the second phase of the investigation for HP and assured the company that the techniques used in the probe were legal.

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