"He was a model citizen, never been arrested, never been to jail," said Leevelle Peoples.
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Sunnyvale police say 34-year-old Peoples is suspected of driving into pedestrians Tuesday night injuring eight people.
Joshua Peoples says his brother is a Iraq War Veteran and was treated for PTSD.
"I didn't see him for a whole year because he was battling mental issues because he didn't take his medicine for PTSD," said Joshua.
Joshua says his brother was also treated at a mental hospital four years ago.
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"He'd been thinking the government was listening to him, house bugged."
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Peoples graduated from Sacramento State in 2012 with a degree in accounting. He was working as a government auditor for the Dept.of Defense in Sunnyvale.
The Peoples family sends their good wishes to the crash victims.