why red jhon didn't check if kira Ttnsley is dead before he left? i guess that he wanted her to say to patrick that the suspect have a tatoo of 3 dots on his left arm because 
i read a theory submited by KJK  and he said that the tyger tyger organisation is an enemie of

red jhon and betram , smeeth and mccallister are involved in it and if this is true , i think that red jhon wanted to get ride of this 3

sorry for my bad english.