I think I know what happened:
Scenario 1:
Conegamer slept in his house all day. He isn't the ninja.
Scenario 2: Conegamer sneaked out and do something , kills someone. Then came back before I woke up.
Scenario 3. Conegamer sneaked out while I was asleep, and done something. But this is not the same house as in the Ninja's description. Not a nija.
Also....my ability said that he has NOT targeted anyone.