BEIJING — Didi Chuxing, China’s popular ride-sharing service, fired two senior executives and suspended a car-pooling service after the second killing of a female passenger in three months.

The crime follows others that have raised questions about the company’s ability to protect women who use its services and comes at a fraught time for Didi, one of the world’s most successful start-ups. It has been expanding at a frenetic pace in China and around the world, and it is widely expected to raise billions of dollars should it seek to sell shares on public markets.

But a string of episodes in China has raised questions about its ability to protect women who use its services. Over the weekend, a number of consumers called online for a boycott of Didi’s services.

The passenger, surnamed Zhao, used Hitch, the Didi car-pooling service, in the eastern city of Wenzhou on Friday. That afternoon, the Wenzhou police said on Sunday, she was raped and stabbed in the neck. The driver was arrested on Saturday.