[Brad’s Gramma]

The article said he was hiking in Altadena.

[Ladypixel]

On the map you're showing of Altadena, see how there's a northern border-type road visible? That road would be New York Drive, and while there's a lot of Altadena north of that road as well, Eaton Canyon Nature Center is off of that road all the way at the northeastern corner, right before the road turns southward and heads into Pasadena. People hike up beyond the nature center all the time.