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Joseph Zak disappeared from his group home in Brookston, Minnesota, on Dec. 7, 2015. Investigators feel that a cellphone ping may have misled the investigation from searching the grounds near where he went missing until it was too late. His case, which remains unsolved, has had no developments since spring 2016.

Joseph Zak disappeared from his group home in Brookston, Minnesota, on Dec. 7, 2015. Investigators feel that a cellphone ping may have misled the investigation from searching the grounds near where he went missing until it was too late. His case, which remains unsolved, has had no developments since spring 2016.

Joseph Zak disappeared from his group home in Brookston, Minnesota, on Dec. 7, 2015. Investigators feel that a cellphone ping may have misled the investigation from searching the grounds near where he went missing until it was too late. His case, which remains unsolved, has had no developments since spring 2016.

Joseph Zak disappeared from his group home in Brookston, Minnesota, on Dec. 7, 2015. Investigators feel that a cellphone ping may have misled the investigation from searching the grounds near where he went missing until it was too late. His case, which remains unsolved, has had no developments since spring 2016.

Joseph Zak disappeared from his group home in Brookston, Minnesota, on Dec. 7, 2015. Investigators feel that a cellphone ping may have misled the investigation from searching the grounds near where he went missing until it was too late. His case, which remains unsolved, has had no developments since spring 2016.

Joseph Zak disappeared from his group home in Brookston, Minnesota, on Dec. 7, 2015. Investigators feel that a cellphone ping may have misled the investigation from searching the grounds near where he went missing until it was too late. His case, which remains unsolved, has had no developments since spring 2016.

Joseph Zak disappeared from his group home in Brookston, Minnesota, on Dec. 7, 2015. Investigators feel that a cellphone ping may have misled the investigation from searching the grounds near where he went missing until it was too late. His case, which remains unsolved, has had no developments since spring 2016.

Joseph Zak disappeared from his group home in Brookston, Minnesota, on Dec. 7, 2015. Investigators feel that a cellphone ping may have misled the investigation from searching the grounds near where he went missing until it was too late. His case, which remains unsolved, has had no developments since spring 2016.

Joseph Zak disappeared from his group home in Brookston, Minnesota, on Dec. 7, 2015. Investigators feel that a cellphone ping may have misled the investigation from searching the grounds near where he went missing until it was too late. His case, which remains unsolved, has had no developments since spring 2016.

Joseph Zak disappeared from his group home in Brookston, Minnesota, on Dec. 7, 2015. Investigators feel that a cellphone ping may have misled the investigation from searching the grounds near where he went missing until it was too late. His case, which remains unsolved, has had no developments since spring 2016.