DOWNEY (CBSLA.com) — A service will be held Sunday for Downey Police Officer Ricardo Galvez.

The 29-year-old was shot and killed while sitting in his parked car near the Downey Police station earlier this month.

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Two adults and a juvenile have been arrested and charged in connection with Galvez’s shooting death.

Police believe the suspects were trying to rob Galvez and were unaware that he was an officer.

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Galvez was also a Marine who served in Iraq and Afghanistan.

Sunday’s viewing and rosary service started at 5 p.m. at the Downey Civic Center.

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A funeral for Galvez will be held Monday 9 a.m. at the Cathedral of Our Lady of the Angels in downtown Los Angeles.