. >> we first came upon larry mendonca, well, on another "dateline" assignment way back in 2009, which is when we shot this video. he was 68 years old then. alone he worked, handing out flyers, gruff and stoic, except when the pain was just too much. >> just that three years -- it's still rough. >> larry took us to sandra's grave. told us how he promised to bring her killer to justice. >> she won't be forgotten as long as i'm alive. >> we had no idea then where this meeting would lead us, that our journey would last a decade, a case that would expose evil lurking in this garden paradise, and bring larry to the edge of his own mortality. many on kauai new sandra, even watched her as a teenager dancing in a local marketing video. like many here, she was multi-racial, growing up in a household that was half japanese, half portuguese, all hawaiian. and a devout catholic who attended saint catherine school with friends alni umala and joanie arita. >> when people ask you what was sandy like, what would you tell them? >> she was absolutely a go-getter. like she was teacher's pet. >> oh, reall