There is a conspiracy theory, that this case and my previous post, Robert Pickton is related:

• Both happened around Vancouver.
• Pickton was working on the pig farm from 1970. He could mix his victims’ bodies with sold pork around 1977.
• There are some theories that prions can cause Parkinson’s. You can get prions if you consume human brain.

The problems with this theory:

• Pickton’s murders officially started later in the 80s.
• The connection between prions and Parkinson’s is not fully understood if there is any
• Officially 4 people is not a Parkinson’s cluster, so it can just happen accidentally without common source.

More info in this reddit thread: https://old.reddit.com/r/todayilearned/comments/y0l3rf/til_michael_j_foxs_first_role_was_in_a_canadian/