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They'll wash the blood away, but won't forget
04:42 - Source: CNN
CNN  — 

One month ago, our concept of horrific mass shootings reached a new extreme.

Ten minutes of gunfire ended the lives of 58 country music fans on the Las Vegas Strip. It was the deadliest mass shooting in modern US history.

But unlike mass shootings of the past, we still know very little about why it happened. Here’s what we’re learning, and what’s still unknown:

What was the gunman’s motive?

The answer remains elusive, and may never surface.

“Usually within 24, 48 hours after an incident like this, we generally know what the motive is,” said CNN law enforcement analyst Art Roderick, a retired assistant director of the US Marshals Service.

But gunman Stephen Paddock, 64, was an unusual mass killer. He was a wealthy retiree. He didn’t have any known ties to radical political or extremist groups. He left no writings or other clues about what prompted him to inflict widespread carnage.

“In my opinion, I think he doesn’t want us to know. He wants us to continue to ask these questions,” Roderick said. “This is a unique case. This individual is almost in a category by himself.”

On Tuesday, the FBI declined to give updates on the case, saying the investigation is ongoing.

What’s the latest on the timeline?

Police have made multiple changes to their timeline of events on October 1, the night Paddock shot a Mandalay Bay security guard and fired into a crowd of 20,000 festivalgoers across the street.