Cyclist Dan Coyle told KTVU he was shocked to find Ma's body along the stretch of water.
"It's very sad, this is a beautiful trail. I take it five days a week. Lots of people take it every day and some people take it to work. It's just very sad to learn that happened, whatever it is."
In a statement in NBC Bay Area, a Google spokesperson said: "Chu Chu was an excellent software engineer in our developer product team. We are devastated to learn of her passing and our deepest condolences are with her family and friends."
The Sunnyvale DPS said an investigation was ongoing and authorities were "awaiting the results of the autopsy report."