(yeah, knowledge arcana is fine. You could also make either a knowledge nature or survival check if you want to check for more mundane causes of death)
Turjan nods and begins inspecting the area, and then the body carefully, poking and prodding here and there with his 10-foot pole. After a while, he stands up and shakes his head, "There aren't any traps that I can find, magical or mundane."
He stands up and holds some of the bundles of papers. The papers themselves are huge, ranging from about the size of a poster to even larger, and most are bound together crudely.
"These papers are also written in an unknown script. They appear to be an ancient form of giant. I can speak giant, but I can't make heads or tails of this. If i spend some time with it, I might be able to figure something out, but I can't make any guarantees. Maybe an hour or so."