Rapper 2 Chainz mourns death of murdered 3-year-old on Instagram

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Atlanta rapper 2 Chainz has written a tribute to a 3-year-old who was shot and killed while asleep in the back of his mother's car on Sunday night.

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In the Instagram post, the rapper shared a photo of him and T'hrigi Diggs at a local event. Diggs was wearing a ribbon saying that he was a "Birthday Boy."

"I really don’t have many words concerning this matter which is really rare for me," 2 Chainz wrote, "This young king was killed inna drive by shooting yesterday in Decatur."

MORE: Vigil held for 3-year-old boy as police search for his killer

Police said that Diggs's shooting appeared to be a random drive-by. Diggs was asleep in the backseat of an SUV his mom was driving when she says a gray Dodge Charge pulled up next to her. The driver fired, hitting Diggs in the chest, police said.

RELATED: Police: Boy, 3, gunned down riding in mom's SUV

"Frankly I’m just appalled man," 2 Chainz wrote. "This kid is around the same age as my son and my heart goes out to his family."

DeKalb County Police said they're looking for a newer model gray Dodge Charger with drive-out tags. Police welcome any tips from anyone who has information.