Authorities say around 13 people have been arrested based on pending warrants against them unrelated to the slayings.
Police say one of the two teenage girls killed last week in northern Indiana recorded the voice of a suspect in their deaths.
Officers responded to the incident Tuesday afternoon where attempts were made to revive Anthony Andrews.
The man's cause of death won't be known until toxicology reports return.
Police are seeking tips from the public in the investigation.
Bunker Hill has been without a police force since December when the former marshal and his four deputies resigned.
Elkhart police will continue using dashboard-mounted cameras in patrol cars.
Indianapolis' mayor is proposing a slate of criminal-justice changes aimed at steering mentally ill and drug-addicted suspects into treatment instead of jail.
Police say the PVC pipe didn't contain any propellant.
Indiana University police say a report of a man with a gun that turned out to be unfounded prompted an emergency notification to campus.