http://toxinnwykxxch2egvmyvtshk6qlo2atisyeu2ikppakioikibcswrlqd.onion
Ricin - an organic poison, consists of two proteins, one protein is responsible for penetration into the cell, the second turns off the ribosomes in the cell, death from general organ failure. There is a version with a disguise, which makes the poison harder to find at autopsy, but I would advise using other poisons.