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Zachary Threats, 36, is accused of killing 30-year-old Kaamil Arnold, who was grilling at a home in the 7700 block of Tioga Street.
Pittsburgh police said Hosea Davis, 37, was shot at least 10 times the afternoon of Jan. 20 and took Rodney Howard Jr. into custody.
State police said Randy Shipley, 60, was found dead inside 105 Crums Lane once firefighters contained the blaze.
The Pennsylvania Turnpike between Butler Valley and Allegheny Valley exits will be closed in both directions for five hours.