BROCKTON, MA – A citywide manhunt is underway for 22-year-old Davinci Leonard, the prime suspect in the execution-style double murder of two teenagers—15-year-old Tymari Albertson and 18-year-old Cevannah Alvarez—in the Westgate Mall parking lot on Saturday evening. Leonard, a Brockton resident who is not originally from the city, remains at large and is believed to be armed and dangerous, having fled the…