Powers was attending the 49ers game at Levi's Stadium on November 12 with his girlfriend and her children, when they got separated inside. He was last seen on surveillance footage leaving Levi's Stadium that night.
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The 32-year-old army veteran was visiting from Spokane, Washington.
The coroner says the cause of Power's death was accidental saltwater drowning.
The Santa Clara Police Department has released a map of where Powers was last seen versus where he was found: