(Portland, OR) -- A nationwide manhunt is ongoing for a man accused of murdering his girlfriend in Powell Butte Nature Park last week. Police say a nationwide arrest warrant has been issued for 43-year-old Jose Antonio Caraballo on a charge of second-degree murder. He's accused of killing 27-year-old Portland business owner Kathryn Muhlbach, who was found dead from homicidal violence in Powell Butte Nature Park on December 9th. Police believe Caraballo has fled the Portland area. Crime Stoppers of Oregon is offering a 25-hundred-dollar reward for information that leads to an arrest.