The Petoskey Police Department solved this cold case after a post-sentencing meeting with 60-year-old Carol Kopenkoskey in late February.
During the meeting, Kopenkoskey admitted to setting fire to the Country Inn Restaurant, a business she owned on the corner of Spring Street and Pleasant Street in Petoskey. The fire happened on June 1986.
She said in a statement to police that she poured a couple of bottles of rubbing alchohol on certain areas of the restaurant and then ignited it with a match, locked the door and left the building to burn to the ground.
She did not say why she did it, but Public Safety Director John Calabrese says the motives in these types of cases are generally the same.
"In arson cases, insurance money is often the motive," Calabrese said.
Kopenkoskey will not be charged for this crime, because of a statute of limitations in the State of Michigan.
But cases like this typically carry a maximum sentence of 20 years in prison.
Kopenkoskey was most recently sentenced to 18-35 years behind bars for the murder her husband Lyle Kopenkoskey.
Carol Kopenkoskey plead guilty to 2nd degree murder on January 22nd after new evidence surfaced in the case.
She was arrested for driving her husband Lyle out to Kiebel Rd. in Petoskey on October 2, 2012 where she shot him five times.
She also admitted that after the murder, she took apart the gun and threw it off the Mackinac Bridge.