Question: What administrative territorial entity is the place where Charles Epstein died a part of?

full_context: Document 1: Vincent Landing, California: Vincent Landing (formerly, Vincents Landing) is an unincorporated community in Marin County, California. It is located on the northeast shore of Tomales Bay southwest of Tomales, at an elevation of 20 feet (6 m).
Document 2: Mount Tamalpais: Mount Tamalpais (; ; Coast Miwok: , known locally as Mount Tam) is a peak in Marin County, California, United States, often considered symbolic of Marin County. Much of Mount Tamalpais is protected within public lands such as Mount Tamalpais State Park, the Marin Municipal Water District watershed, and National Park Service land, such as Muir Woods.
Document 3: San Francisco: San Francisco is located on the West Coast of the United States at the north end of the San Francisco Peninsula and includes significant stretches of the Pacific Ocean and San Francisco Bay within its boundaries. Several picturesque islands—Alcatraz, Treasure Island and the adjacent Yerba Buena Island, and small portions of Alameda Island, Red Rock Island, and Angel Island—are part of the city. Also included are the uninhabited Farallon Islands, offshore in the Pacific Ocean. The mainland within the city limits roughly forms a "seven-by-seven-mile square", a common local colloquialism referring to the city's shape, though its total area, including water, is nearly .
Document 4: Muir Beach, California: Muir Beach is a census designated place (CDP), unincorporated community, and beach that is located northwest of San Francisco in western Marin County, California, United States. It is named for John Muir. The population was 310 at the 2010 census. The community itself flanks the northwest side of the beach.
Document 5: Charles Epstein (geneticist): Charles Joseph Epstein (September 3, 1933 – February 15, 2011) of Tiburon, California, was a geneticist who was severely injured in 1993 when he became a victim of a mail bomb attack by the Unabomber. He was a researcher at the University of California, San Francisco and the Buck Institute for Age Research.
Document 6: Gerald Epstein: Gerald N. Epstein (November 6, 1935 – February 18, 2019) was an American psychiatrist who uses mental imagery and other mental techniques to treat physical and emotional problems. An author and a researcher, he was the founder and director of a mental imagery school for post-graduate mental health professionals, teaching imagery as a tool for healing and a "bridge to the inner world".
Document 7: Barbara Epstein: Epstein, née Zimmerman, was born in Boston, Massachusetts, to a Jewish family, and graduated from Radcliffe College in 1949. In 1953, she and editor Jason Epstein began a marriage that lasted 37 years.
Document 8: Bird Island (Marin County, California): Bird Island is a small island between Point Bonita and Rodeo Cove in southern Marin County, California. It is located off the coast of Marin Headlands, about three miles from San Francisco.
Document 9: Tiburon, California: Tiburon is an incorporated town in Marin County, California. It is located on the Tiburon Peninsula, which reaches south into the San Francisco Bay. The smaller city of Belvedere (formerly a separate island) occupies the south-west part of the peninsula and is contiguous with Tiburon. Tiburon is bordered by Corte Madera to the north and Mill Valley to the west, but is otherwise mostly surrounded by the Bay. Besides Belvedere and Tiburon, much of the peninsula is unincorporated, including portions of the north side and the communities of Strawberry and Paradise Cay.
Document 10: Imperial College London: In September 2014, Professor Stefan Grimm, of the Department of Medicine, was found dead after being threatened with dismissal for failure to raise enough grant money. The College made its first public announcement of his death on 4 December 2014. Grimm's last email accused his employers of bullying by demanding that he should get grants worth at least £200,000 per year. His last email was viewed more than 100,000 times in the first four days after it was posted. The College has announced an internal inquiry into Stefan Grimm's death. The inquest on his death has not yet reported.
Document 11: Hillsborough, California: Hillsborough is an incorporated town in San Mateo County, California, in the San Francisco Bay Area. It is located south of San Francisco on the San Francisco Peninsula, bordered by Burlingame to the north, San Mateo to the east, Highlands-Baywood Park to the south, and Interstate 280 to the west. The population was 11,273 as of 2013.
Document 12: Jason Epstein: Born to a Jewish family on August 25, 1928 in Cambridge, Massachusetts. An only child, he attended public schools in Milton, Massachusetts. He graduated from Columbia College of Columbia University in 1949 and was elected to Phi Beta Kappa. He received a Master of Arts degree from Columbia the following year and joined Doubleday and Company as an editorial trainee.
Document 13: Helen Epstein (HIV/AIDS journalist): Helen Epstein (born 1961) is an American writer, molecular biologist, and independent consultant specializing in public health in developing countries. She has conducted research on reproductive health and AIDS in Africa for such organizations as the Rockefeller Foundation, the Population Council, and Human Rights Watch, and her articles have appeared in "The New York Review of Books", "The New York Times Magazine", "Granta Magazine", and many other publications. Her research interests include the right to health care in developing countries and the relationship between poverty and health in industrialized countries.
Document 14: James Charles Kopp: James Charles Kopp (born August 2, 1954) is an American citizen who was convicted in 2003 for the 1998 sniper-style murder of Barnett Slepian, an American physician from Amherst, New York who performed abortions. Prior to his capture, Kopp was on the FBI's list of Ten Most Wanted Fugitives. On June 7, 1999 he had become the 455th fugitive placed on the list by the FBI. He was affiliated with the militant Roman Catholic anti-abortion group known as "The Lambs of Christ".
Document 15: Belvedere Island, California: Belvedere Island is an unincorporated community in Marin County, California. It lies at an elevation of 69 feet (21 m). Belvedere Island is on the part of Belvedere Island (in San Francisco Bay) that is not incorporated in the city of Belvedere.
ground_truth: Marin County
sub_queries: Charles Epstein >> place of death Answer: Tiburon
Tiburon >> located in the administrative territorial entity Answer: Marin County