Question: What is the cause of death of Alex Matthiessen's father?

Knowledge 1: Alex Matthiessen
Alex Matthiessen (born July 3, 1964) is an environmentalist and lives in New York City.He is the son of author and naturalist Peter Matthiessen. [SEP] Knowledge 2: Peter Matthiessen
Peter Matthiessen (May 22, 1927 – April 5, 2014) was an American novelist, naturalist, wilderness writer, zen teacher and CIA officer.A co-founder of the literary magazine "The Paris Review", he was the only writer to have won the National Book Award in both fiction and nonfiction.He was also a prominent environmental activist.Matthiessen's nonfiction featured nature and travel, notably "The Snow Leopard" (1978) and American Indian issues and history, such as a detailed and controversial study of the Leonard Peltier case, "In the Spirit of Crazy Horse" (1983).His fiction was adapted for film: the early story "Travelin' Man" was made into "The Young One" (1960) by Luis Buñuel and the novel "At Play in the Fields of the Lord" (1965) into the 1991 film of the same name.In 2008, at age 81, Matthiessen received the National Book Award for Fiction for "Shadow Country", a one-volume, 890-page revision of his three novels set in frontier Florida that had been published in the 1990s.According to critic Michael Dirda, "No one writes more lyrically [than Matthiessen] about animals or describes more movingly the spiritual experience of mountaintops, savannas, and the sea."Matthiessen was treated for acute leukemia for more than a year.He died on April 5, 2014, three days before publication of his final book, the novel "In Paradise" on April 8.
Knowledge 1: Peter Matthiessen
Peter Matthiessen (May 22, 1927 – April 5, 2014) was an American novelist, naturalist, wilderness writer, zen teacher and CIA officer.A co-founder of the literary magazine "The Paris Review", he was the only writer to have won the National Book Award in both fiction and nonfiction.He was also a prominent environmental activist.Matthiessen's nonfiction featured nature and travel, notably "The Snow Leopard" (1978) and American Indian issues and history, such as a detailed and controversial study of the Leonard Peltier case, "In the Spirit of Crazy Horse" (1983).His fiction was adapted for film: the early story "Travelin' Man" was made into "The Young One" (1960) by Luis Buñuel and the novel "At Play in the Fields of the Lord" (1965) into the 1991 film of the same name.In 2008, at age 81, Matthiessen received the National Book Award for Fiction for "Shadow Country", a one-volume, 890-page revision of his three novels set in frontier Florida that had been published in the 1990s.According to critic Michael Dirda, "No one writes more lyrically [than Matthiessen] about animals or describes more movingly the spiritual experience of mountaintops, savannas, and the sea."Matthiessen was treated for acute leukemia for more than a year.He died on April 5, 2014, three days before publication of his final book, the novel "In Paradise" on April 8. [SEP] Knowledge 2: Michael Jai White
Michael Richard Jai White( born November 10, 1967) is an American actor, director, and martial artist.He is the first African American to portray a major comic book superhero in a major motion picture, having starred as Al Simmons, the protagonist in the 1997 film" Spawn".White appeared as Marcus Williams in the Tyler Perry films" Why Did I Get Married?" and" Why Did I Get Married Too?", and starred as the character on the TBS/ OWN comedy- drama television series" Tyler Perry's For Better or Worse".White portrayed Jax Briggs in and the Cyborg Seth in, the return.He portrayed boxer Mike Tyson in the 1995 HBO television movie" Tyson".He also played the title role in the blaxploitation parody film" Black Dynamite", as well as the animated series of the same name.
Knowledge 1: Peter Matthiessen
Peter Matthiessen (May 22, 1927 – April 5, 2014) was an American novelist, naturalist, wilderness writer, zen teacher and CIA officer.A co-founder of the literary magazine "The Paris Review", he was the only writer to have won the National Book Award in both fiction and nonfiction.He was also a prominent environmental activist.Matthiessen's nonfiction featured nature and travel, notably "The Snow Leopard" (1978) and American Indian issues and history, such as a detailed and controversial study of the Leonard Peltier case, "In the Spirit of Crazy Horse" (1983).His fiction was adapted for film: the early story "Travelin' Man" was made into "The Young One" (1960) by Luis Buñuel and the novel "At Play in the Fields of the Lord" (1965) into the 1991 film of the same name.In 2008, at age 81, Matthiessen received the National Book Award for Fiction for "Shadow Country", a one-volume, 890-page revision of his three novels set in frontier Florida that had been published in the 1990s.According to critic Michael Dirda, "No one writes more lyrically [than Matthiessen] about animals or describes more movingly the spiritual experience of mountaintops, savannas, and the sea."Matthiessen was treated for acute leukemia for more than a year.He died on April 5, 2014, three days before publication of his final book, the novel "In Paradise" on April 8. [SEP] Knowledge 2: Tasha Smith
Tasha Smith( born February 28, 1971) is an American actress, director and producer.She began her career in a starring role on the NBC comedy series" Boston Common"( 1996 – 97), and she later appeared in numerous movies and television series.Smith has appeared in films include" The Whole Ten Yards"( 2004)," Daddy's Little Girls"( 2007)," The Longshots"( 2008)," Couples Retreat"( 2009), and" Jumping the Broom"( 2011).She starred as Angela Williams in the Tyler Perry films" Why Did I Get Married?"( 2007), its sequel" Why Did I Get Married Too?"( 2010), and on the television series based on the movies," For Better or Worse"( 2011–2017).In 2015, she began a recurring role as Carol Holloway on the Fox musical drama series" Empire".Later in the same year, Smith made her directorial debut.

Answer: leukemia