The Boston Police Department is asking for the public's help in locating a murder suspect. Oscar Rosa, 20, of Natick has been identified as being responsible for the stabbing murder of 32-year-old Craig Vierra. On December 8, 2006 Vierra passed away as a result of injuries sustained from a November 26, 2006 stabbing incident. On November 26, 2006 at 2:15am, a Boston Police officer performing a detail on Lansdowne St. observed an altercation in front of 13 Lansdowne. The officer proceeded to that location and en route heard someone yelling that someone had been stabbed. The officer immediately observed several males fleeing from the scene and gave chase. While pursuing these fleeing individuals, one was observed to discard a knife. The individual that discarded the knife was caught and placed under arrest after a brief pursuit The suspect, Oscar Rosa, was subsequently positively identified and placed under arrest for Assault and Battery by Means of a Dangerous Weapon. The victim was transported to Beth Israel Hospital and was treated. As a result of Vierra’s death, Boston Police detectives applied for and were granted an arrest warrant for Oscar Rosa. Rosa’s charges have been upgraded to Murder. Suspect Description: Race: Black Hispanic Gender: Male Age: 20 Complexion: Light-skinned Hair: Black Eyes: Brown Height: 5 ft. 8in. Lbs: 205 License Plate: unknown Last Known Address: Natick Anyone with information about the whereabouts of Oscar Rosa is urged to contact Boston Police Homicide Detectives at 617-343-4470 or to remain anonymous call the Crime Stoppers Tip Line at 1-800-494-TIPS. Identities of callers wishing to remain anonymous shall be protected.