A romance as intense as Jodi Arias and Travis Alexander’s couldn’t possibly last forever. But how did it lead to one of the most-followed murder trials in years? Josh Mankiewicz reports Along Came Jodi on Friday, March 1st, at 8pm/7c.

Olympic track star Oscar Pistorius was famous and adored, but in an instant, everything changed. “Dateline” tells the astonishing story of the murder case against the ‘Blade Runner’ that has shocked the world. Keith Morrison reports new and exclusive details, exploring the public and private lives of both Pistorius and Reeva Steenkamp, the girlfriend he shot to death.  Life and Death In the Fast Lane airs Friday, March 1st, at 9pm/8c.

Read the written statement that Chris Hall submitted for his sentencing hearing on July 22, 2011, as featured in the Dateline report Someone Was Watching from Sunday, February 24th, 2013: 

On June 7th, 2007, I lost my wife and my daughters lost their mother to a tragic accident. No matter how it is twisterd - 1/2 truths told or wild theories provided - the truth is it was a tragic accident that has devastated our family.

I loved Cristi on that day and I love her even more today.  Contrary to what has been told in this court there has never been any act of violence in our home let alone some "hidden rage of violence" as portrayed by the DA.

Cristi and I have 3 beautiful daughters that have grown up in a loving home to be smart, intelligent women.  As the girls were planning their adult lives, Cristi and I were looking forward to the rest of our lives together.  Cristi was my best friend and lover and I miss her terribly.

No matter how many high fives, back slaps, or congratulations that were provided on May 31st, 2011, it does not change the truth - and that I did not and never have hurt nor raised a hand to Cristi.

As much as I wish and know that I should not be here today being sentenced to a crime that did not even happen let alone I commit. There is nothing more you can do to me.  The worst day of my life has already happened on June 7, 2007.

Right now the only thing keeping me going is our 3 daughters Courtney, Briana, and Ashtin.  For if it was not for them and their future families I am not sure how I would feel about life at all.

Cristi and Chris Hall who were married for nearly 30 years and had three daughters, had what most people thought was the perfect marriage until Cristi was found dead in the backyard spa. Keith Morrison reports Someone Was Watching on Sunday, February 24th, at 7pm/6c.

When a young beauty queen is murdered in her apartment, the investigation leads to two different defendants and results in three criminal trials. Keith Morrison reports What Happened to the Beauty Queen? on Friday, February 22nd, at 8pm/7c.

Also on Dateline Friday, Carol Lubahn suddenly vanishes, leaving behind her husband and two young children. But why would she leave them? Authorities open a decades-old cold case and with the help of Facebook and social media, they search for an answer. Keith Morrison reports Secrets In the Mist on Friday, February 22nd, at 9pm/8c.

Once a hometown hero in Coldwater, Michigan, Tom Foley is shocked to find himself the lead suspect in the case of his wife Darlene's murder.

When Darlene failed to show up at their son's 10th birthday party, Tom said he feared the worst and returned home to find her shot dead in the shower. Though investigators never found the murder weapon, a suspicious bag of shotgun shells found in the basement along with testimonials from Tom and Darlene's son and his friend about a strange noise they heard that day, lead to Tom's conviction. Thinking the case was over, the defense team is soon approached by a stranger with new evidence that would turn everything upside down.

Dateline NBC's Josh Mankiewicz reports The Mystery at Heath Bar Farm on Sunday, February 17th, at 7pm/6c.

In the Dateline report A Gathering Storm, a love triangle involving a beauty queen, a devoted wife, and a guitar hero ultimately leads to murder. Explore the investigation's key locations across the country, unfolding over many years, in the interactive map below:

View Dateline NBC Map: 'A Gathering Storm' in a larger map

A love triangle involving a beauty queen, a devoted wife and a guitar hero leads to murder, and an investigation that stretches across the country and takes years to unfold. Josh Mankiewicz reports A Gathering Storm on Friday, February 15th, at 8pm/7c.

As the full moon rose over the Sierra Nevada Mountains, someone broke into the home of Ben and Melissa Oxley and shot 36-year-old Ben in the head, as he slept next to his wife. How the shooter managed to break in, shoot Ben without harming his wife, and leave without a trace of evidence boggled detectives for years. What really happened while they were sleeping?

Dateline NBC's Keith Morrison reports While They Were Sleeping  on Sunday, February 10th, at 8pm/7c.

When a pastor loses two wives in suspicious accidents, authorities wonder: was it terrible luck … or murder? Dennis Murphy reports Fallen on Friday, February 8th, at 8pm/7c.