His new character approached the party's night camp in the dark, with a Darkness spell up.
He got spotted but couldn't see who was out looking for him. He heard them (natural 20 on a Listen check.). So he, ever brilliant, sent his Small Air Elemental familiar to see what was going on.
The party Scout, noting that the party is in a Necropolis ("city" that is nothing but burial sites) and has been attacked by undead, spotted the Elemental, and bloody near killed it on sight. Rolled a 23 total on a Knowledge Religion and realized that it wasn't an undead, so he held his shot.
New PC is the brother of the dead PC, who somehow managed to track the party down in the middle of the desert, alone and on foot. He wants custodody of his sister's body. Oh, and her possessions as well.
We made it clear that:
A) We don't know him from Adam, and just because he says he's her brother doesn't mean a thing. (He's Human with an aquatic template, but not the same race as the deceased PC.)
B) We were taking the Priestess of Ra back to her temple, where they would either raise her or bury her. And since Egyptions liked to take it with them when they died, he was not getting her stuff.
He's still trying to dictate a Will, to direct distribution of magical gear. We've said no, repeatedly, making it clear that our characters would not loot their dead friend's corpse.
At some point someone will notice that he's not actually the same race that she was. So, approaching an adventuring party by night, in a valley of the dead, under cover of a Darkness spell, and then introducing yourself with an obvious and easily provable lie is not the way to begin a relationship. Adventuring together means risking your lives together. That requires trust, which he has shredded before we finished exchanging names.