Wendy Budde (Angela's Sister)

They never give their names, never leave their phone numbers, license plates, anything like that.

That was Hilda Marcela Cabrales.

The 26-year-old architect was still alive in the ICU and fighting for her life.

And in Durango, Mexico, her mother, Hilda Marcela Plascencia, was getting the news about her eldest daughter and namesake.

You are a doctor.

What was going on in your mind at the time?

And in the earliest hours of the investigation, there were only questions.

How could this happen to Christy?

It was an unimaginable ending to a life bursting with exuberance.

Christy was an adventurer, traveling the world as a high-fashion model for Wilhelmina.

She ultimately made LA her home.

At 21, her life took a dramatic turn.

She met Jan Sillier, a South African-born artist, photographer, and special effects editor, 17 years her senior.

They'd been together seven months when the couple went to Burning Man, an arts festival in the Nevada desert, where impulsively, they took a big leap.

After they got married, Christy started studying interior design in Los Angeles, which led to a new friendship with Hilda Marcella.

Hilda had just moved there to start her dream job, recalls her father, Luis.

I feel very happy for her, but very sad for me because we are very close.

No one was surprised that the cum laude graduate of the prestigious university in Monterrey, Mexico, was thriving in LA, especially her sister Fernanda.

Dancing, as this video shows, is what the two friends were doing that night.

Kristi's husband Jan was out of town visiting his father.