Verified answer

A woman named Regina from the freighter kills herself.

Karl & Danielle

A few background survivors

Alex

Doctor Ray and Captain Gault from the freighter

The background mercenaries from the freighter

Martin Keamy, leader of the mercenaries

Michael

All the background freighter people and a few more background survivors

We hear about Nadia's death off the island, see it in Season 5.

In the final flash-forward of the season finale, Locke is shown off the island in a coffin. How he got there is in Season 5.