Whitworth, who was appointed chairman on an interim basis in April last year, has been a member of the Board since 2011. His resignation will be effective July 16.
Details of Whitworth's ailment were not disclosed.
He will also take a leave of absence from his investment company, Relational Investors, which he co-founded in 1996.
The HP board of directors will discuss appointing a new chairman at its next board meeting, HP said in a statement.
"Ralph has been a friend and close advisor to me, the HP leadership team and every member of the board for nearly three years. He has been a wonderful contributor to our efforts to turn HP around," HP President and CEO Meg Whitman said.
Relational Investors, in a statement said, Whitworth's duties at the firm will be assumed by co-founder David Batchelder and other members of the senior management team.
"Relational remains fully committed to serving its clients' interests and wishes Ralph and his family all the best at this difficult time. Out of respect for Ralph's privacy, the firm is not providing any additional information," it added.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
