On Sunday, April 16, at 7 pm (ET/PT), 60 Minutes viewers will revisit Newtown nearly 4½ years after the Sandy Hook Elementary School massacre to see how some families of the victims and the community are still healing from one of the deadliest mass school shootings in American history.

The segment features Nicole Hockley and Mark Barden, co-founders and managing directors of Sandy Hook Promise (SHP), who each lost their first grade sons, Dylan Hockley and Daniel Barden, in the shooting, and how they have dedicated their lives to prevent similar incidents from happening in the United States.

"There isn't a day that goes by where I don't think about the tragic event that took the life of my beautiful butterfly Dylan," said Nicole Hockley. "However, we wanted 60 Minutes to document the lasting and rippling effects gun violence can have on a family. We at Sandy Hook Promise also want to change the national conversation around gun violence to let people know that they can take action to prevent this from happening in their community as well."

Viewers will see first-hand how SHP goes into schools in red and blue states to train youth and adults how to be "upstanders" instead of hopeless bystanders with their free Know the Signs programs. The organization does this by teaching students how to create an inclusive community through its Start With Hello program, as well as how to identify someone exhibiting at-risk behaviors and how to properly intervene before a violent act happens through its Say Something program. Two additional free Know the Signs programs designed for adults and educators are also available for schools and youth organizations.

To date, SHP has trained over 1.9 million youths and adults across the country with their Know the Signs programs. Through the programs the organization has helped avert two school shootings, suicides and other acts of violence, as well as helped reduce bullying.

In addition to its education programs, Ms Hockley and Mr Barden have also been instrumental in working at the state level on pushing Extreme Risk Protection Orders (ERPOs), especially after Congress failed to pass common sense gun reform legislation. ERPOs temporarily remove guns from a person deemed to be an imminent risk to themselves or others. It is known that when a gun is involved during a mental health crisis, the likelihood of a lethal outcome increases. ERPOs have been linked to a decrease in suicides and could have helped prevent mass shootings like the recent incident at North Park Elementary School in San Bernardino, and the shooting at the Fort Lauderdale-Hollywood International Airport that happened earlier this year.

 Sandy Hook Promise (SHP) is a national, nonprofit organization based in Newtown. For more information visit www.sandyhookpromise.org or call 203-304-9780.