SAN FRANCISCO, Aug. 17 -- A Wyoming woman whose childhood photographs were turned into thousands of sexually explicit images by her stepfather using xAI's Grok chatbot has joined a class action lawsuit against the company, becoming the fourth plaintiff in a case that attorneys say could eventually represent thousands of victims.

The woman, identified in court filings as Jane Doe 4, says her stepfather generated more than 7,000 sexually explicit images by feeding Grok photographs from her childhood, including a photo taken when she was 11 years old. Law enforcement raided his devices. Two days later, he died by suicide.

The original lawsuit was filed by three teenagers from Tennessee who made similar allegations about Grok's role in gene...