(Waukegan, IL)  A suspect has died, after swallowing an unknown substance in Waukegan.

Police say they were on their way to serve a search warrant Thursday afternoon when they spotted an individual approaching the residence they were headed to. The male subject was known to have an arrest warrant, and fled as authorities approached. That man also started swallowing an unknown white substance.

As he was being taken into custody, the suspect started struggling, and rescue crews were called…who rushed the man to the hospital where he was pronounced dead. That individual is not being identified at this point, and an investigation has been launched by Illinois State Police.