This undated family photo shows Kevin Collins, a 10-year-old San Francisco boy who disappeared in 1984. A law enforcement official tells The Associated Press that investigators were digging in the backyard and the basement of a home near the city's Haight-Ashbury district in search of evidence in Collins' disappearance Tuesday, Jan. 29, 2013. (AP Photo/Family Photo via San Francisco Chronicle) NORTHERN CALIFORNIA MANDATORY CREDIT PHOTOG & CHRONICLE; MAGS OUT; NO SALES

Associated Press
This undated family photo shows Kevin Collins, a 10-year-old San Francisco boy who disappeared in 1984. A law enforcement official tells The Associated Press that investigators were digging in the backyard and the basement of a home near the city's Haight-Ashbury district in search of evidence in Collins' disappearance Tuesday, Jan. 29, 2013. (AP Photo/Family Photo via San Francisco Chronicle)  NORTHERN CALIFORNIA MANDATORY CREDIT PHOTOG & CHRONICLE; MAGS OUT; NO SALES
This undated family photo shows Kevin Collins, a 10-year-old San Francisco boy who disappeared in 1984. A law enforcement official tells The Associated Press that investigators were digging in the backyard and the basement of a home near the city's Haight-Ashbury district in search of evidence in Collins' disappearance Tuesday, Jan. 29, 2013. (AP Photo/Family Photo via San Francisco Chronicle) NORTHERN CALIFORNIA MANDATORY CREDIT PHOTOG & CHRONICLE; MAGS OUT; NO SALES
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