APPLE VALLEY (CBSLA.com) — The family of an Army specialist shot to death on his way to Bible study is looking for answers.

Relatives of Daniel Yarbrough say they need help finding the person who shot and killed him in Apple Valley late last month.

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“I couldn’t think of anybody that would do something like that to him. He was just a quiet person,” said Yarbrough’s sister, Feticha Oliphant.

Oliphant said her younger brother had been in the military for three years, joining after the death of their mother.

“That was her last wishes for him to, you know, go ahead and serve his country,” she said.

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Deputies found Yarbrough fatally shot in his car, where a cross has now been erected next to photos of the 31-year-old.

His sister said she was told by military personnel that her brother was on his way to a Bible study at a friend’s home before he was killed.

“He was real outgoing, and he just loved life, and it’s just crazy that his beautiful smile nobody’s going to be able to see anymore,” she said.

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Oliphant is planning a walk at 1 p.m. Saturday starting near the roadside vigil erected in memory of her late brother in the 16200 block of Muni, Apple Valley.