Worthy appealed the ruling, but lost. The case had been scheduled for trial early next month, but Worthy decided against going forward.
In requesting that the case be dismissed, assistant prosecutor Michael Reynolds told Talon on Thursday that some witnesses have died and others' memories have faded. Plus, he said, some physical evidence has not been located.
Talon accepted the explanation and dismissed the charges without prejudice, which means prosecutors could decide to charge the brothers again someday.
"I wish them good luck with their lives," the judge said.
The brothers were convicted by a judge in 1988 of fatally shooting Karey at his home near City Airport.
Talon threw out the brothers' first-degree murder convictions based on new testimony from witnesses who didn't come forward at the time.
The witnesses, former Grosse Pointe school friends, claimed they went to the house to buy marijuana. One of them, John Hielscher, has said he saw the attackers at the drug house and they were black. The Highers are white.
Hielscher said he was scared to say anything at the time and that two decades passed before he learned that the Highers had been convicted.