COVINA, Calif. (KABC) -- The grieving family of a 16-year-old boy who was shot and killed at a back-to-school pool party in Covina over the weekend is searching for answers.

The shooting happened just after 10 p.m. Saturday in a residential neighborhood near East Camellia Drive and Peachtree Lane, according to the Covina Police Department.

A memorial for the victim, identified by family members as Joel Mercado, continues to grow with more candles and flowers as community members and loved ones mourn the teenager.

Mercado's sister told Eyewitness News he was at the party with a friend, but there are still many unanswered questions.

"It's just hard because we don't know what happened. We weren't there. We didn't get to say any goodbyes, we didn't get to be there with him at all. He wa

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