Yana daya daga cikin manyan wadanda ake zargi a shari'ar Jack-Riga, amma ba a taba jan hankalin kotu ba saboda karancin babban shaida. An haife kifi a cikin garin Klodo a cikin 1865, a cikin 1881 ya yi hijira zuwa Burtaniya kuma ya zauna tare da danginsa a gundumar farin farin fararen fata. An kama shi da kuma gano shi tare da ɗayan Shaidun, waɗanda daga ƙarshe sun ƙi bayar da shaidar a kansa. Kotmonsky ya mutu a cikin 1919 yana da shekaru 53 a cikin gidan mahaukaci, inda aka tilasta sanya shi.
Mai ba da labari Russell Edwards ya kasance mai ban sha'awa game da binciken Jack ta hanyar wannan yanayin, amma ya yanke hukuncin cewa ba za a iya warware wannan sirrin ba.
Ya zuwa yanzu, a 2007, a daya daga cikin gwanjo, bai sayi Shawl ba, wanda ke da daya daga cikin wadanda wadanda ke fama da kisan da ke fama da cutar Catherwe. Saukar da Shawl Simpson, wanda ke kan aiki a daren kisan, daga abin da ya faru. Ya dauki Shawl don matarsa, amma saboda rigunan jini ba sa sa sa. An riƙe abin kuma ya wuce daga tsara zuwa tsara bakwai da suka wuce ba ta buga gwanjo ba. Lokacin da Edward ya samu Shawl, ya fahimci cewa yana da a hannunsa, wataƙila haskoki na Biritaniya, amma bai san inda za a fara ba.
Ya juya don neman taimako ga masanin kimiyya yari Lucalaen. "Lokacin da muka sami gaskiya, shi ne mafi ban mamaki ji a rayuwata," in ji Mr. Edwards. Ya ce wannan binciken bayan shekaru 126 da kisan gilla ya tabbatar da cewa cosmmones suna daya daga cikin wadanda ake zargin na shida a wannan yanayin - shi ne ainihin kisa.