Prosecutors on Thursday charged a Salt Lake City-area police officer with manslaughter, alleging he violated police department policy and law enforcement standards when he shot an unarmed man through the back window of a pickup truck. An expert who reviewed the Oct. 9, 2024, shooting concluded that Taylorsville police officer Jimmy Jeremy Haas did not use a reasonable amount of force, Salt Lake County prosecutors allege in their information supporting the second-degree felony manslaughter charge. The shooting happened about half a mile (1 kilometer) outside the Taylorsville city limits in suburbs a few miles (5 kilometers) south of downtown Salt Lake City. Prosecutors in court documents didn’t identify the man shot but said that Haas, driving an unmarked police spot-utility vehicle, had followed the pickup truck into a parking lot.…