Sorrento Therapeutics Inc. announced the death of its Chief Business Officer and Executive Vice President Amar Singh. Singh died unexpectedly of apparent natural causes on July 30.

“Sorrento is deeply saddened and shocked by the loss of our dear friend and colleague. Our immediate thoughts go to Amar’s family and friends,” Sorrento’s President and Chief Executive Officer Henry Ji said.

Singh joined Sorrento (NASDAQ: SRNE) in January 2014 from Synta Pharmaceuticals Corp. (NASDAQ: SNTA), where he served as senior vice president and chief business officer since December 2010. Previously, Singh served as chief operating officer at Abraxis. Prior to Abraxis, he held multiple commercial leadership positions in the oncology franchise at Hoffman-La Roche for over 10 years.