5 Things to Know This Morning

— -- Your look at the five biggest and most buzz-worthy stories of the morning.

1. Virginia Man Believes Daughter's Nightmares Hold Clue to Wife's Fatal Accident

A Virginia dad said he believes his 3-year-old daughter's nightmares may be more than just dreams and could be clues to solving the mystery of his wife's death.

Craig Tyler's wife, Natali Castellanos-Tyler, died Feb. 21 after she "lost control" of her 2002 Ford Explorer and "struck a tree," the Chesterfield County Police said in a news release at the time. Her daughter, who was 2 at the time and in the car, survived and was transported to a hospital with "minor injuries," police added.

But while a police spokeswoman told ABC News the crash investigator believes icy roads and weather were factors in the "single-vehicle" accident, the Mosely, Virginia, man now suspects foul play after listening to his 3-year-old's nightmares, he told ABC News.

2. New Video Shows Boston Marathon Bomber in Holding Cell

An image of Boston Marathon bomber Dzhokhar Tsarnaev making an obscene gesture to a surveillance camera three months after the deadly bombing was released by the government, a day after it was shown to the jurors deciding if Tsarnaev should get the death penalty.

The image came from video of Tsarnaev in a holding cell in July 2013 before his arraignment. That April, Tsarnaev and his brother Tamerlan detonated twin pressure cooker bombs near the finish line of the Boston Marathon killing three people, including an eight-year-old boy, and injuring 260 others. Tamerlan was killed in a police shootout three days after the bombing and Dzhokhar was convicted earlier this month on 30 counts related to the blasts.

3. 5 Nursing Students Killed in Georgia Interstate Crash

Five nursing students died early Wednesday in a chain-reaction crash in southeast Georgia that authorities said began when a tractor-trailer failed to slow down and smashed into stop-and-go traffic.

Those killed were traveling on Interstate 16 near Savannah in two passenger vehicles mangled by the crash. The tractor-trailer plowed into an SUV, then rolled over a small passenger car that burst into flames, said Sgt. 1st Class Chris Nease of the Georgia State Patrol. The big truck came to a halt after slamming into the back of a tanker.

All five of the dead were nursing students at Georgia Southern University in Statesboro, about 30 miles from the crash site. St. Joseph's/ Candler Health System said the students were commuting to St. Joseph's Hospital in Savannah for their last day of clinical training of the school year.

4. Ex-CIA Chief Will Be Sentenced for Leaking Military Secrets

Former CIA Director David Petraeus, whose career was destroyed by an extramarital affair with his biographer, was expected to be sentenced today in federal court in Charlotte for giving her classified material while she was working on the book.

Petraeus will appear at the sentencing, which comes two months after he agreed to plead guilty to a misdemeanor count of unauthorized removal and retention of classified material.

The plea agreement carries a possible sentence of up to a year in prison. In court papers, prosecutors recommended two years of probation and a $40,000 fine. But the judge is not bound by that and could still impose a prison sentence.

5. South Dakota Offers Alternative to Dying on Mars

South Dakota officials, in an attempt to attract new residents to the Mt. Rushmore state, are asking a new and provocative question: "Why die on Mars, when you can live in South Dakota?"

That's the slogan they've attached to a new workforce development campaign, as teased in a YouTube video, set to begin next month. "We think Mars has what South Dakota wants," Pat Costello, commissioner of the Governor‘s Office of Economic Development, said. "Thousands of people lining up to live there."