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Howard Berkes

Updated at 4:50 p.m. ET

Investigators in Las Vegas are sifting through evidence they've gathered from the homes of the man who sprayed a concert crowd with gunfire. They've begun to interview his girlfriend. They've learned quite a bit about Stephen Paddock's past and preparation, but there is still no explanation for why he damaged and destroyed so many lives.

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The second-highest ranking member of the Florida Senate pledged a legislative review of a state law that has allowed injured undocumented workers to be arrested and potentially deported rather than paid workers' compensation benefits.

"Legitimate injuries shouldn't be denied just because the person was an undocumented immigrant," said Republican Sen. Anitere Flores, the president pro tempore of the state Senate and chairwoman of the Banking and Insurance Committee.

At age 31, Nixon Arias cut a profile similar to many unauthorized immigrants in the United States. A native of Honduras, he had been in the country for more than a decade and had worked off and on for a landscaping company for nine years. The money he earned went to building a future for his family in Pensacola, Fla. His Facebook page was filled with photos of fishing and other moments with his three boys, ages 3, 7 and 8.

But in November 2013, that life began to unravel.

NPR's ongoing investigation of the advanced stage of the fatal lung disease that afflicts coal miners has identified an additional 1,000 cases in Appalachia.

That brings the NPR count of progressive massive fibrosis, the most serious stage of the disease known as black lung, to nearly 2,000 cases in the region, all of which were diagnosed since 2010.

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Former Massey Energy CEO Don Blankenship is marking his release from federal custody with an appeal for vindication by the U.S. Supreme Court.

Blankenship served a one-year federal prison sentence after being convicted of conspiracy to violate federal mine safety laws. The charges stemmed from the disaster at a Massey Energy mine in West Virginia in 2010 that left 29 coal miners dead.

Updated at 6:25 p.m. ET

Two Democratic members of Congress want three federal agencies to work together to get a more accurate count of coal miners suffering from progressive massive fibrosis, the worst stage of the fatal disease known as black lung.

The request is a response to an NPR investigation that shows 10 times as many cases of the advanced stage of black lung as identified and reported by the National Institute for Occupational Safety and Health.

Across Appalachia, coal miners are suffering from the most serious form of the deadly mining disease black lung in numbers more than 10 times what federal regulators report, an NPR investigation has found.

The government, through the National Institute for Occupational Safety and Health, reported 99 cases of "complicated" black lung, or progressive massive fibrosis, throughout the country the last five years.

West Virginia's Democratic candidate for governor is a billionaire, a philanthropist and a resort and coal mine owner who cites his business and mining experience as major attributes as he seeks to lead his home state out of a severe budget and economic crisis.

"I am not a career politician; I am a career businessman," wrote Jim Justice in an April 5 op-ed that appeared in the Charleston Gazette-Mail.

A "race to the bottom" in state workers' compensation laws has the Labor Department calling for "exploration" of federal oversight and federal minimum benefits.

"Working people are at great risk of falling into poverty," the agency says in a new report on changes in state workers' comp laws. Those changes have resulted in "the failure of state workers' compensation systems to provide [injured workers] with adequate benefits."

Injured workers face "inherent conflict of interest," barriers to benefits, "unequal treatment," limited appeals and little to no independent oversight when employers opt out of state-regulated workers' compensation, according to a new study.

An injured worker featured in an NPR/ProPublica investigation of the opt-out alternative to workers' compensation has settled with the company that denied her medical care and wage-replacement payments after an incident at work.

U.S. Department of Labor Secretary Thomas Perez says his agency will use its "bully pulpit" to strike at what he calls "a disturbing trend" that leaves workers without medical care and wage replacement payments when they are injured on the job.

In an interview with NPR, Perez also confirms a Labor Department investigation of an opt-out alternative to state-regulated workers' compensation that has saved employers millions of dollars but that he says is "undermining that basic bargain" for American workers.

An Oklahoma law that lets employers opt out of state-regulated workers' compensation has been rejected and declared unconstitutional by state regulators.

The Oklahoma Workers' Compensation Commission called the alternative workplace-benefit plans that some employers adopted under the law "a water mirage on the highway that disappears upon closer inspection."

The unanimous ruling by the commission, issued Friday, is expected to be appealed.

When NPR reported Bob Ebeling's story on the 30th anniversary of the explosion of the space shuttle Challenger, hundreds of listeners and readers expressed distress and sympathy in letters and emails.

Thirty years ago, as the nation mourned the loss of seven astronauts on the space shuttle Challenger, Bob Ebeling was steeped in his own deep grief.

The night before the launch, Ebeling and four other engineers at NASA contractor Morton Thiokol had tried to stop the launch. Their managers and NASA overruled them.

That night, he told his wife, Darlene, "It's going to blow up."

Kevin Schiller had no idea what hit him.

With 21 years on the job, the building engineer for Macy's department stores had been in and out of every nook and cranny of many of the retail giant's Texas stores, including the storage room in the Macy's in Denton, Texas.

One minute, the stocky, 6-foot-2 Schiller was searching there for a floor drain. The next, he was sprawled on the floor, stunned, confused and bleeding slightly.

Updated 7:30 p.m. ET with Kline comment

Ten ranking Democrats on key Senate and House committees are urging the Labor Department to respond to a "pattern of detrimental changes in state workers' compensation laws" that have reduced protections and benefits for injured workers over the past decade.

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