Hurd, part of Oracle’s top executive team including fellow co-CEO Safra Catz and chairman Larry Ellison, took a leave of absence from the database giant in September, citing unspecified health reasons.

Ellison said in a public note about Hurd on Friday, “It is with a profound sense of sadness and loss that I tell everyone here at Oracle that Mark Hurd passed away early this morning.”

Hurd joined Oracle as president in 2010 after resigning from Hewlett Packard following an internal investigation of an alleged inappropriate relationship with a contractor. In 2014, he then took on the role of co-CEO after Ellison stepped down as CEO to become chairman and chief technology officer.

During Hurd’s tenure, Oracle tried to adapt to a major shift by providing on-demand computing to companies seeking to reduce their spending on corporate data center hardware. Companies like Amazon and Microsoft gained traction amid the new reality while Oracle struggled.

Executives from other tech companies including Cisco and SAP shared their condolences via Twitter on Friday.

A number of Oracle employees tweeted about Hurd’s death Friday morning.