It's Tuesday, January 24th. It was the best night of the week until a man walked in with the gun.

We start here.

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From ABC News, this is Start Here. I'm Brad Milky.

I'm Brad Milky.

The Star Ballroom Dance Studio has been a local institution in Monterrey Park, California for 30 years.

It's home to legit ballroom dancing competitions.

It hosts classes throughout the week, Foxtrot, Rumba, Waltz.

Like a lot of ballroom dance spots, its students are often middle-aged couples and older folks looking to have a good time.

Uniquely, this place serves a largely Chinese American clientele.

And when you watch videos of past events here, like this line dancing class, it's like the definition of good clean fun.

When police arrived at that ballroom on Saturday night after reports of a shooting, they described discovering a bloodbath.

Inside, they came across a scene that none of them had been prepared for.

Initially, they found 10 people shot to death.

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