Shocking mobile phone footage showed an angry mob attacking Sebastian Woodroffe, 41, in the remote Amazonian village of Ucalyali as retribution.
The video, posted on Facebook, showed two men dragging Woodroffe by a noose around his neck in front of onlookers.
Prosecutors have identified the two men and are working to determine who else took part in the lynching, according to a judicial ruling that ordered their arrests.
But less is known about the slaying of Olivia Arevalo, 81, the revered shaman of the Shipibo-Conibo tribe who was shot dead near her home on Thursday.
Ricardo Jimenez, the head of a group of prosecutors in Ucayali, said no one witnessed Arevalo's shooting.
He also said the murder weapon has not been found and a test for gunshot residue on Woodroffe's body will likely take 15 to 20 days.
Woodroffe had been Arevalo's patient and her family believes he killed her because she refused to conduct a ritual in which the hallucinogenic Amazonian plant brew ayahuasca is used for healing and spiritual growth, said Jimenez.
Authorities are exploring several theories related to Arevalo's murder, including one in which another foreigner might have killed her over an unpaid debt, Jimenez said.
Arevalo's slaying prompted outrage as it followed the unsolved killings of other indigenous people in the Amazon region who had faced threats for trying to protect their land.
Woodroffe was believed to have been studying natural medicine under Arevalo, the elderly shaman who ran a healing centre offering ayahuasca – an Indigenous hallucinogenic mixture.
Ricardo Palma Jimenez, the head of the group of prosecutors in Ucayali, confirmed that the man in the video was Woodroffe and that he had been strangled to death after receiving several blows across his body.
Policing is scant over much of the Peruvian Andes and Amazon and villagers in far-flung provinces often punish accused criminals according to local customs.
Woodroffe moved to Ucayali after raising funds to help him learn more about plant medicine in Peru to become an addictions counselor, according to the crowdfunding website Indiegogo.com.
Canada's foreign affairs department said it was in touch with Peruvian officials. "We are aware of this case and actively seeking further information," Global Affairs Canada said in a statement.
Mr Jiminez added: "We will not rest until both murders, of the Indigenous woman as well as the Canadian man, are solved."
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Ms Lomas's murder has prompted outrage in Peru, following other unsolved murders of indigenous activists who had repeatedly faced death threats related to efforts to keep illegal loggers and oil palm growers off native lands.
Woodroffe, from British Columbia, was one of thousands of foreign tourists who travel to the Peruvian Amazon to experiment with ayahuasca, a bitter, dark-coloured brew made of a mixture of native plants.
The hallucinogenic cocktail, also known as yage, has been used by indigenous tribes in Brazil, Peru, Ecuador and Colombia as a cure for numerous ailments.
But it's also increasingly consumed by Western tourists looking for mind-altering experiences, sometimes with deadly consequences.
Arevalo was a staunch defender of indigenous people's rights in the region.
She also practised a traditional form of singing medicine that the Shipibo believe removes negative energies from individuals and a group alike.
In 2015, a Canadian fatally stabbed a fellow tourist from England after the two drank ayahuasca together in a spiritual ceremony a few hours' drive from where Woodroffe was killed.
Neither Woodroffe's nor Arevalo's family could be reached for comment.
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