Illinois authorities are investigating after bones were discovered at the site of a former truck wash that they believe may be connected to an incarcerated serial killer who worked as an over the road truck driver.

According to a report from local news outlet WGLC, on Wednesday, September 2, police discovered two bones at the site of a former truck wash location in La Salle, Illinois.

It isn’t yet clear whether the bones are human and further investigation was delayed due to heat issues with the cadaver dogs.

Police began investigating after 61 year old convicted serial killer and former Ohio-based long haul trucker Dellmus Colvin (dubbed the “Interstate Strangler”) appeared on a true crime podcast called “Where the Bodies Are Buried.”

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During the phone interview, Colvin described meeting a woman at a truck stop in La Salle and then disposing of her body at the truck wash. He said that he then transported her clothing with him in a garbage bag to Council Bluffs, Iowa.

Colvin has admitted to strangling six prostitutes to death in Ohio from 2000 — 2005. He also pled guilty to the murder of a woman in Atlantic City in 1987 and is currently serving two life sentences plus 30 years.

Colvin has previously told police that he has killed around 50 people in various locations throughout the country.

The investigation into the remains discovered on Wednesday will be spearheaded by the Illinois State Police.

You can click here to listen to the podcast featuring Colvin on Spotify.