CHICAGO (CBS) — A memorial service was held Saturday for a 25-year-old man who was shot and killed during a robbery earlier this week, and his family and friends made a plea for justice.

WBBM Newsradio’s Mike Krauser reports Raymond Murray’s loved ones sang, and prayed, and released balloons in a cold rain just feet from where the armed security guard was slain as he was walking home in the South Shore neighborhood on Thursday.

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Murray, 25, was walking on the 7800 block of South Jeffery Boulevard around 3:30 a.m. Thursday, when he was shot. He was pronounced dead at the scene, about two blocks from his home.

“A young lady distracts him, talking to him. The other person, he’s around the corner. Runs up on him, shoots him,” his grandfather, Arthur Stoudemire said. “They took his gun, took his cell phone. It wasn’t even on the news, like it didn’t happen.”

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Murray’s anguished mother could see her son’s body from their apartment, and stared for hours as police processed the scene, Stoudemire said.

“I need this to stop,” Murray’s mother sobbed, surrounded by friends and family on Saturday.

She and another relative pleaded for an end to the violence.

“We are all we have. We’re one black family. We’re one black family,” one relative said.

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Murray had attended college on a music scholarship, then came home several years ago to care for his ailing mother, who is now preparing to bury her son.