Criminal Minds Season 4 Episode 25

This story was most likely based on the case of Canadian serial killer Robert "Willie" Pickton, who targeted women, many of them prostitutes, in British Columbia. Pickton was a pig farmer, and remains of his victims were found in pig feces on his farm. Pickton was convicted of six murders, charged with another 20, and allegedly confessed to 49 murders in total to undercover police officers. He is currently serving 25 to life, the longest sentence possible in Canadian law for murder.

The attack on the guard post at the border crossing would not have resulted in the involvement of the RCMP from the way the episode was filmed. It appeared as though William Hightower never actually crossed the Blue Water Bridge, which made his attack and arrest occur in Port Huron, Michigan, and not in Sarnia, Ontario, Canada.

The license tags on the car left by the unsub on the bank of the St. Clair River had the wrong tags for both Michigan and Ontario, Canada. Ontario generally has white tags with blue lettering on them and Michigan plates are a wide variety of color schemes, e.g., green and white, orange and pale blue sunset, or mainly white background with blue lettering. Also, license plates on the front and back of an automobile are not required in Michigan.