Dejan Belnavis signs extradition waiver in California, set to return for trial.
Belnavis, 27, held in California since capture near San Diego Zoo.
Multi-state manhunt ends following tragic double murder in Worcester, Massachusetts.
Victims Chastity Nuñez and her 11-year-old daughter Zella shot dead in parked SUV.
Belnavis and accomplice linked to the fatal shooting.
Nuñez remembered for her service and resilience in the National Guard.
Nuñez and Zella mourned as victims of senseless violence.