(KTRS) – St. Charles Police are looking for a gun that could be connected to at least six murders.

The police are offering a $25,000 reward for information that leads to the arrest or conviction of a serial killer. Police are looking for an Erma Werke ET-22 handgun that they believe was used to murder six shop clerks in 1992. All of the murders happened at shops along Interstate 70 and 35 between Indianapolis and Wichita, Kansas.

One of the victims, Nancy Kitzmiller was killed in St. Charles.

If you know of someone who had this type of weapon in the spring of 1992, please call St. Charles Police at 1-800-800-3510.