During a response to a question about abortion, Biden mentioned, seemingly out of nowhere, a young woman who was recently murdered by an immigrant — an apparent reference to a 12-year-old Houston girl who was strangled to death, allegedly by two Venezuelan men who entered the country illegally.

The connection to abortion was unclear.

https://apnews.com/live/presidential-debate-2024-updates

This isn’t the 1970s… We don’t have to rely on our memories of what happened

If you don’t believe the AP’s live updates, if the full debate is uploaded to YouTube somewhere you can watch Biden say it.