SAN FRANCISCO -- The discovery of skeletal remains in a seaside treehouse could bring closure for Frank Pangelinan Cruz's siblings, who have been searching for their brother for two decades.

On April 20, a hiker spotted the bones on a platform woven into a cypress tree, 150 feet down a steep cliff overlooking the ocean and only accessible by rope.

Authorities found identification belonging to Pangelinan Cruz, born in 1943 in Guam, and asked for help in confirming the body's identity. They still haven't determined the cause of death.

Pangelinan Cruz's sister, Chris Castro, 64, who lives in Yigo in northern Guam, said she contacted the San Francisco medical examiner's office after reading about the discovery.

None of his relatives has heard from Pangelinan Cruz since 1984, when he was working as a pipe fitter at the U.S. Naval Shipyard in Vallejo. He joined the U.S. Army in the early 1960s and moved to San Francisco in 1977 to work in the electronics industry, his family said.

"I suppose it brings some type of closure -- we have been trying to search for him for many, many years," said Anna Pangelinan, his 57-year-old sister.