Stealthing through a player gate your revealed when you stealth through it. The teleporters are set it friends only would mean someone who is friended killed you, or someone used a cheat hack.
I know who killed me and they were NOT friended. As I said, the only way to the floor I was on was via teleport set to friends so the only other way they could of got access was via a gate cast from that floor. If I gate out somewhere and they entered the gate into my house I wouldn't of seen them as I would be at the place I just cast the gate to while they were going to where the gate came from

. They could then just hide inside normally and kill me when I returned. That is the ONLY legal way possible to kill me on that floor. As such it was just carelessness on my part and a lesson learned so now I do an automatic 'detect hidden' up on entering my house and now ONLY gate from the public area downstairs if I am leaving the place hopefully to avoid this in future .
It is the reason I asked Eaerendil if that was 'my joint' as he said in his original post that he and a friend had
seen someone 'teleporting' to a house and killing the owner. Still don't know if it was but if so it wasn't a stealther gating in. If that is the case I want to know if was my place as if it was MY place then I need to look at how to 'protect' against it if possible, or at least know whether there is anything that can be done other than making the house totally private to avoid it.
If the only way to stop this is to make a place private then I may as well pack up on siege and not bother as the ONLY reason I decided to play on siege was to run a vendor mall, and hopefully start my event company up, but there is no point in investing more time, MONEY and energy into it if I have to make my places 'private' just for basic security and not having my chars dry looted at the whim of someone coming in via nefarious means or for that matter having people who attend any event I may run slaughtered inside buildings due to the same problem. I don' t mind getting killed 'legitimately' as it is up to me to be more careful etc etc, but I do mind it if there is bugger all I can do because people are not playing within the rules.