The couple began a hike on a 16-mile trail Tuesday at Zion National Park and started facing cold weather overnight into Wednesday morning, according to a news release from the National Park Service.The husband, 33, left his wife on a trail to go get help early Wednesday, according to park officials.“First responders administered emergency aid, but they determined she was deceased,” park officials said in the news release.“Zion National Park’s response involved more than 20 search and rescue team members.”The cause of the woman’s death is under investigation by the Washington County Sheriff’s Office, Utah Office of the Medical Examiner and the National Park Service.The high on Tuesday in Zion National Park was 49 degrees Fahrenheit, and dropped to 19 degrees overnight into Wednesday morning, according to CNN Weather."