Police are asking for the public's help in finding a man wanted in connection with the murder of his ex-girlfriend last month in the McKinley Park neighborhood.Tony Hernandez, 48, allegedly shot and killed 41-year-old Maria Lazaro-Castillo in a 2013 Nissan Pathfinder during an argument the morning of Oct. 13 in the 3800 block of South Damen Avenue, Chicago police said. Hernandez fled, “eluding police,” but detectives made telephone contact with Hernandez, “who is refusing to turn himself in and has told family members that he will be taking his own life,” according to police reports obtained by the Chicago Sun-Times.Lazaro-Castillo had received an order of protection against Hernandez last month, but it hadn’t been served to him at the time of the shooting, according to the reports and Miguel Valenzuela, Lazaro-Castro's brother-in-law.Hernandez frequently visits areas of Brighton Park, McKinley Park, Archer Heights and Garfield Ridge , police said.Police urged anyone with information to contact Area 1 Violent Crimes Detective, Paul Gentile, (312) 747-8380, or submit an anonymous tip at CPDTIP.com and use reference # JH466663. Tony Hernandez Chicago Police Department