"Federal and local law enforcement officers searched a home in San Francisco's Haight-Ashbury neighborhood Tuesday as part of a renewed probe into the 1984 disappearance of 10-year-old Kevin Collins, but found little except apparent animal bones, authorities said." - The San Francisco Chronicle
After researching a bit about Kevin Collins (thanks to Wikipedia), I found out that he gained national attention as one of the first missing children to appear on milk cartons and national press like Newsweek. On February 10th 1984, Kevin left basketball practice early and waiting for the 43 Muni bus (Oak and Masonic) when he disappeared. Supposedly the man who used to live at the Page and Masonic corner was a key suspect in Kevin Collins case but authorities did not provide any more detail.
Hours of investigation and loud helicopters hovering overhead, it ended with police only finding animal remains in the backyard rather than the remains of the missing boy.
Information courtesy of: SFist, CBS News, SF Chronicle, Uppercasing