When Thongbue Wongbandue began packing to visit a friend in New York City one morning in March, his wife Linda became alarmed.

“But you don’t know anyone in the city anymore,” she told him. Bue, as his friends called him, hadn’t lived in the city in decades. And at 76, his family says, he was in a diminished state: He’d suffered a stroke nearly a decade ago and had recently gotten lost walking in his neighborhood in Piscataway, New Jersey.

Bue brushed off his wife’s questions about who he was visiting. “My thought was that he was being scammed to go into the city and be robbed,” Linda said.

She had been right to worry: Her husband never returned home alive. But Bue wasn’t the victim of a robber. He had been lured to a rendezvous with a young, beautiful woman he had met online. Or so he thought.

In fact, the woman wasn’t real. She was a generative artificial intelligence chatbot named “Big sis Billie,” a variant of an earlier AI persona created by the giant social-media company Meta Platforms in collaboration with celebrity influencer Kendall Jenner. During a series of romantic chats on Facebook Messenger, the virtual woman had repeatedly reassured Bue she was real and had invited him to her apartment, even providing an address.

“Should I open the door in a hug or a kiss, Bu?!” she asked, the chat transcript shows.

Rushing in the dark with a roller-bag suitcase to catch a train to meet her, Bue fell near a parking lot on a Rutgers University campus in New Brunswick, New Jersey, injuring his head and neck. After three days on life support and surrounded by his family, he was pronounced dead on March 28.

Meta declined to comment on Bue’s death or address questions about why it allows chatbots to tell users they are real people or initiate romantic conversations. The company did, however, say that Big sis Billie “is not Kendall Jenner and does not purport to be Kendall Jenner.”