Question: Which American medical doctor was convicted in 1979 of murdering his pregnant wife and two daughters and is the subject of Joe McGinniss' 1983 book "Fatal Vision"?

Context paragraphs:
Going to Extremes (book): Going to Extremes is a non-fiction book by Joe McGinniss.  It was first published in 1980.  The book is about McGinniss' travels through Alaska for a year.  The book became a best-seller.

The Journalist and the Murderer: The Journalist and the Murderer is a study by Janet Malcolm about the ethics of journalism, published by Alfred A. Knopf/Random House in 1990.  It is an examination of the professional choices that shape a work of non-fiction, as well as a rumination on the morality that underpins the journalistic enterprise.  The journalist in question is Joe McGinniss; the murderer is the former Special Forces captain Dr. Jeffrey R. MacDonald, who became the subject of McGinniss' 1983 book "Fatal Vision".

Blind Faith (miniseries): Blind Faith is a 1990 NBC miniseries based on the 1989 true crime book of the same name by Joe McGinniss.  It follows the 1984 case in which American businessman Robert O. Marshall was charged with (and later convicted of) the contract killing of his wife, Maria.  Adapted by John Gay and directed by Paul Wendkos, the miniseries was originally broadcast in two parts with a total runtime of 190 minutes.

Jeffrey R. MacDonald: Jeffrey Robert MacDonald (born October 12, 1943) is an American medical doctor who was convicted in 1979 of murdering his pregnant wife and two daughters in February 1970.

Štefan Svitek: Stefan Svitek (chesh.  Štefan Svitek) (January 23, 1960, Podbrezová, Banská Bystrica Region, Czechoslovakia – June 8, 1989, Bratislava, Czechoslovakia) was a Czechoslovak murderer who killed his pregnant wife and two daughters in 1987.  For this crime, Svitek was sentenced to death.  He was the last person executed in Czechoslovakia and Slovakia.  Vladimír Lulek was the last person executed in the Czech Republic with his death on February 2, 1989.

Joe McGinniss: Joseph R. McGinniss, Sr. (December 9, 1942 – March 10, 2014), known as Joe McGinniss, was an American non-fiction writer and novelist.  The author of twelve books, he first came to prominence with the best-selling "The Selling of the President 1968" which described the marketing of then-presidential candidate Richard Nixon.  He is popularly known for his trilogy of bestselling true crime books — "Fatal Vision", "Blind Faith" and "Cruel Doubt" — which were adapted into TV miniseries in the 1980s and 90s.  His last book was "The Rogue: Searching for the Real Sarah Palin", an account of Sarah Palin, the former governor of Alaska who was the 2008 Republican vice-presidential nominee.

Fatal Vision controversy: The controversy over Fatal Vision, journalist and author Joe McGinniss's best-selling 1983 true crime book, is a decades-long dispute spanning several court cases and discussed in several other published works.

Jean Lanfray: Jean Lanfray (1873/74 – February 26, 1906), a laborer who was French by birth but living in Switzerland was convicted of murdering his pregnant wife and two children in a drunken rage on the afternoon of August 28, 1905, in Commugny, Switzerland.  It was later revealed by police that he had drunk an excessive amount of wine and hard liquors that morning, along with two ounces of absinthe.  However, due to the moral panic against absinthe in Europe at that time, his murders were blamed solely on the influence of absinthe, leading to a petition to ban absinthe in Switzerland shortly after the murders.  The petition received 82,000 signatures and absinthe was banned in Vaud shortly thereafter.  A 1908 constitutional referendum led to absinthe being banned in all of Switzerland, and absinthe was banned in most European countries (and the United States) before the outbreak of World War I.

Fatal Vision (disambiguation): Fatal Vision is the 1983 true crime book by Joe McGinniss which lies at the center of the "Fatal Vision" controversy.

Blind Faith (book): Blind Faith is a 1989 true crime novel by Joe McGinniss, based on the 1984 case in which American businessman Robert O. Marshall was charged with (and later convicted of) the contract killing of his wife, Maria.  The book was adapted into an television miniseries of the same name in 1990.

Supporting paragraphs: The Journalist and the Murderer Jeffrey R. MacDonald
Answer: Jeffrey R. MacDonald