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FILE - In this March 2, 1984 file photo, Ann and David Collins, parents of missing 10-year-old Kevin Collins, hold one of their posters during a news conference in San Francisco. Kevin Collins, disappeared Feb. 10, 1984 while returning home from basketball practice. 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/Paul Sakuma, File)

Associated Press
FILE - In this March 2, 1984 file photo, Ann and David Collins, parents of missing 10-year-old Kevin Collins, hold one of their posters during a news conference in San Francisco. Kevin Collins, disappeared Feb. 10, 1984 while returning home from basketball practice.  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/Paul Sakuma, File)
FILE - In this March 2, 1984 file photo, Ann and David Collins, parents of missing 10-year-old Kevin Collins, hold one of their posters during a news conference in San Francisco. Kevin Collins, disappeared Feb. 10, 1984 while returning home from basketball practice. 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/Paul Sakuma, File)
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