I am not sure about Pierre Laceniare - he is recalled for one murder and an attempted murder that got botched (which was of a bank messanger - it was a murder for profit). He did supposedly kill a man (a nephew of the writer Benjamin Constant) in a duel about 1830 but it is a duel.
Similarly the murder of Jean Kinck, his son, and then his wife and other children by Jean Baptiste Troppman is a murder for profit, and I hesitate to consider that too - although there were time gaps in the Kinck murders.
I am glad you included Doctor Warder - the forgotten Victorian poison killer, who was once an expert witness (for Dr. Palmer, of all people) at a homicide trial.
Voirbo is also confusing - The murder of Bodace (a well-planned one if ever there was one) was for gain. He is responsible for the death (from delerium tremens) of an alcoholic suspect (Jefer?), but that killing was not planned. There is a possibility he killed a young woman at a cottage, but that has never been firmly established. His record of multiple killings is reminiscent of John Alexander Dickman - convicted of killing John Nisbet on that Newcastle train, and suspected in the death of Mrs. Luard and that moneylender.
Pritchard too is confusing. He certainly poisoned his wife and mother in law
(for which he hanged in 1865) but that was in one long instance. He probably also killed a maid he may have gotten pregnant in 1863.
But the methods are different (poison for the wife and in-law; drug the maid and let her burn to death or die of smoke inhalation).One might also consider secret poisoner (and hanged as a wife murderer) Eugene Chantrelle, who may have killed an earlier acquaintance with a doctored luncheon in the 1870s.
A late 19th Century practitioner who may have branched out and offered his ideas to others was Arthur J. Monson of the Ardlamont Mystery. Check out the essay on him by Roughead (as well as the essay on Chantrelle).
Jeff
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