Question: What county is the place of death of Walt Whitman located in?

full_context: Document 1: Walt Whitman Bridge: The Walt Whitman Bridge is a single-level suspension bridge spanning the Delaware River from Philadelphia to Gloucester City, in Camden County, New Jersey, United States. Named after the poet Walt Whitman, who resided in nearby Camden toward the end of his life, the Walt Whitman Bridge is one of the larger bridges on the east coast of the United States. The bridge is owned and operated by the Delaware River Port Authority.
Document 2: Marlton, Camden: Marlton is a neighborhood in Camden, New Jersey. According to the 2000 U.S. Census, the neighborhood has a population of 5,049.
Document 3: Camden, Michigan: Camden is a village in Camden Township, Hillsdale County in the U.S. state of Michigan. The population was 512 at the 2010 census.
Document 4: Whitman Park, Camden: Whitman Park is a neighborhood in Camden, New Jersey. Located north of Woodlynne, Whitman Park has a population of 6,574.
Document 5: Gateway, Camden: Gateway is a neighborhood located in the central part of Camden, New Jersey. According to the 2000 U.S. Census, Gateway has a population of 2,439.
Document 6: Camden Township, Schuyler County, Illinois: Camden Township is located in Schuyler County, Illinois. As of the 2010 census, its population was 229 and it contained 126 housing units.
Document 7: Highland Park, Michigan: Highland Park is a city in Wayne County in the State of Michigan, within Metro Detroit. The population was 11,776 at the 2010 census. The city is completely surrounded by Detroit except for a small portion that touches the city of Hamtramck, which is also surrounded by Detroit.
Document 8: Carmody Hills, Maryland: Carmody Hills is an unincorporated community in Prince George's County in the State of Maryland in the United States of America. Because it is not formally incorporated, it has no official boundaries, but the United States Census Bureau has defined a census-designated place consisting of Carmody Hills and the adjacent community of Pepper Mill Village, together designated "Peppermill Village", for statistical purposes. (At the 2000 census the area was delineated as "Carmody Hills-Pepper Mill Village".) Carmody Hills is located on the south side of Seat Pleasant Drive and east of Seat Pleasant.
Document 9: Alden Park Manor: Alden Park Manor is a living community located at 5500 Wissahickon Avenue in the Germantown neighborhood of Philadelphia, Pennsylvania in the United States.
Document 10: Rosedale, Camden: Rosedale is a neighborhood in Camden, New Jersey. It is located on the border with Pennsauken Township and has a population of 1,807.
Document 11: Cambridge Township, Henry County, Illinois: Cambridge Township is one of twenty-four townships in Henry County, Illinois, USA. As of the 2010 census, its population was 2,525 and it contained 1,070 housing units.
Document 12: Creative Arts Morgan Village Academy: Creative Arts Morgan Village Academy (CAMVA) is a seven - year magnet public middle / high school that focuses on fine and performing arts programs in addition to academic programming for students in seventh through twelfth grades in the City of Camden, in Camden County, New Jersey, United States, operating as part of the Camden City Public Schools. The school opened in 1999 with a freshman class of under 50 students, as one of three magnet schools in Camden, along with Brimm Medical Arts High School and MetEast High School. As of 2011, the academy added a middle school program for grades 6 - 8. Camden residents entering sixth or ninth grades are eligible to apply and must demonstrate interest in a particular field of the arts as well as meet minimum grade and attendance standards. Admission is based on a combination of criteria including auditions, academic scores and interviews.
Document 13: Camden, Maine: Camden is a town in Knox County, Maine, United States. The population was 4,850 at the 2010 census. The population of the town more than triples during the summer months, due to tourists and summer residents. Camden is a famous summer colony in the Mid-Coast region of Maine. Similar to Bar Harbor, Nantucket and North Haven, Camden is well known for its summer community of wealthy Northeasterners, mostly from Boston, New York and Philadelphia.
Document 14: Camden, North Carolina: Camden is an unincorporated community and census-designated place (CDP) in Camden County, North Carolina, United States. It is the county seat of Camden County, a consolidated city-county. As of the 2010 census, the Camden CDP had a population of 599.
Document 15: Beideman, Camden: Beideman is a neighborhood name in the East Camden section of the City of Camden, New Jersey, USA. According to the 2000 U.S. Census, Beideman has a population of 5,677. The neighborhood name Beideman originates from a prominent family that lived there, with several notable members including Benjamin C. Beideman and Horace B. Beideman. The name Beideman has been frequently misspelled as "Biedman" or "Biedeman". The East Camden neighborhoods of Beideman and Pavonia are also considered part of the neighborhood of Cramer Hill.
ground_truth: Hillsdale County
sub_queries: Walt Whitman >> place of death Answer: Camden
Camden >> located in the administrative territorial entity Answer: Hillsdale County