The killer has traditionally been considered to have been left handed, but some today think that this may have been based more upon negative connotations of left handed people in that time than fact. <ref>http://www.casebook.org/dissertations/rip-left.html</ref> It is likely that his victims were first strangled before he used his knife, which could also account for the fact that not a single one was heard to cry out. <ref>Three witnesses reporting hearing a cry of "Murder!" coming from the direction of Mary Jane Kelly's room at 4am on the morning of her murder, but nobody went to investigate.</ref> There has also been conjecture as to whether or not he had medical knowledge or training, or at the very least, an understanding of human anatomy. | The killer has traditionally been considered to have been left handed, but some today think that this may have been based more upon negative connotations of left handed people in that time than fact. <ref>http://www.casebook.org/dissertations/rip-left.html</ref> It is likely that his victims were first strangled before he used his knife, which could also account for the fact that not a single one was heard to cry out. <ref>Three witnesses reporting hearing a cry of "Murder!" coming from the direction of Mary Jane Kelly's room at 4am on the morning of her murder, but nobody went to investigate.</ref> There has also been conjecture as to whether or not he had medical knowledge or training, or at the very least, an understanding of human anatomy. |