Father of Sandy Hook school shooting victim keeps his son's memory alive

1 of 6 — Mark Barden, third from left, poses with his surviving family members in this undated photograph, from left: eldest son James, daughter Natalie and wife Jackie.

Mark Barden, third from left, poses with his surviving family members in this undated photograph, from left: eldest son James, daughter Natalie and wife Jackie.

Mark and Jackie Barden

2 of 6 — Daniel Barden was just seven years old when he was killed, along with his 19 of his first-grade classmates and six staff members at Sandy Hook Elementary School in Newtown, Connecticut in 2012.

Daniel Barden was just seven years old when he was killed, along with his 19 of his first-grade classmates and six staff members at Sandy Hook Elementary School in Newtown, Connecticut in 2012.

Mark and Jackie Barden

3 of 6 — Little Big Town singer Karen Fairchild, Mark Barden and singer-songwriter Sheryl Crow speak in the documentary "A Father's Promise," which Crow executive produced.

Little Big Town singer Karen Fairchild, Mark Barden and singer-songwriter Sheryl Crow speak in the documentary "A Father's Promise," which Crow executive produced.

A Father's Promise LLC

Mark Barden's daughter Natalie performs with Sheryl Crow for a concert featured in the documentary <em>A Father's Promise</em>, which Crow executive produced.

4 of 6 — Mark Barden's daughter Natalie performs with Sheryl Crow for a concert featured in the documentary A Father's Promise, which Crow executive produced.

Mark Barden's daughter Natalie performs with Sheryl Crow for a concert featured in the documentary A Father's Promise, which Crow executive produced.

A Father's Promise LLC

Mark Barden and his daughter Natalie perform during a concert featured in the documentary <em>A Father's Promise</em>.

5 of 6 — Mark Barden and his daughter Natalie perform during a concert featured in the documentary A Father's Promise.

Mark Barden and his daughter Natalie perform during a concert featured in the documentary A Father's Promise.

A Father's Promise LLC

Mark Barden, left, performs with guitarist and singer Jimmy Vivino during a concert featured in the documentary <em>A Father's Promise</em>.

6 of 6 — Mark Barden, left, performs with guitarist and singer Jimmy Vivino during a concert featured in the documentary A Father's Promise.

Mark Barden, left, performs with guitarist and singer Jimmy Vivino during a concert featured in the documentary A Father's Promise.

A Father's Promise LLC