(Portland, OR)  --  Portland Police Cold Case Detectives are working new leads in a 31-year-old murder case.  In 1986, Michael Koseniensky went to answer a ring at his doorbell and someone just shot him.  He died at a hospital later on, but his killers were never found.  A new detective on the case says multiple pieces of evidence collected around the crime scene can now be tested for DNA, so it's hoped the decades-old murder case can soon be solved.