No he is not, but he is responsible for the safety of shuli. Everyone under shuli is responsible for not stopping her, that is their role as a servant.
But they also blamed him for being the killer because he was found in the scene of the crime, a knight under shuli which is fully capable of protecting her mistress. Making it very suspicious.
is sir abington the real killer?
But the in chapter 59 (i guess) he's also shock on what happen to shulli
arrgg it's not sir abington right?