NEWTOWN, Conn. – When Alissa and Robbie Parker met face to face recently with the father of the young man who killed their daughter and 19 other first-graders at Sandy Hook Elementary School, they weren't angry with him and didn't blame him for the massacre.

Instead, the Parkers said they and Peter Lanza shared their condolences for one another and talked about his son, Adam Lanza, during the emotional meeting, which lasted more than an hour.

"I don't feel like he should be held responsible for what happened that day," Alissa Parker told "CBS This Morning" during the second part of an interview that aired Friday. "That was not ultimately his decision to do that, so how can I hold him responsible? Were there missteps in the raising of his son? Possibly."