A US computer science professor best known for his association with Google co-founders Larry Page and Sergey Brin has drowned at his home in California.
Motwani mentored Page and Brin while they were students at Stanford University.
"He played just as big a role in my research, education, and professional development," Brin wrote in a blog posting.
Brin said when he and Page began to work together on the research that would lead to Google, Rajeev was there to support them and guide them through challenges.
"Today, whenever you use a piece of technology, there is a good chance a little bit of Rajeev Motwani is behind it," Brin wrote.
A paper written in 1998 by Brin, Page, Motwani and fellow Stanford professor Terry Winograd described the development of Google's search engine.
Motwani helped co-ordinate a regular meeting on data mining, which was the technology at the heart of Google's success, said Brin.