Strathroy-Caradoc, Ont., police have laid charges in a sudden death investigation that began in July 2020.
According to a post-mortem examination, a 49-year-old man died due to a fentanyl overdose.
Police say they identified the individual who provided the man with the lethal drug.
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John Lalonde, 49, has been charged with manslaughter and criminal negligence causing death.
He is to appear in a London court on Feb. 1, 2023.