Of the four main characters all the actors and actresses have passed away. RIP Greene, Landon, Blocker, and Roberts. AnswerParty.
Television in the United States
Television is one of the major mass media of the United States. Household ownership is 96.7% and the majority of households have more than one. Its peak was the 1996-1997 season with 98.4% ownership.  As a whole, the television networks of the United States are the largest and most syndicated in the world.
As of August 2013, there are approximately 114,200,000 American households with television.
Michael Landon (born Eugene Maurice Orowitz; October 31, 1936 – July 1, 1991) was an American actor, writer, director, and producer. He is known for his roles as Little Joe Cartwright in Bonanza (1959–1973), Charles Ingalls in Little House on the Prairie (1974–1983), and Jonathan Smith in Highway to Heaven (1984–1989). Landon appeared on the cover of TV Guide 22 times, second only to Lucille Ball.
Landon produced, wrote, and directed many of his series' episodes, including his shortest-lived production, Father Murphy, which starred his friend and "Little House" co-star Merlin Olsen. In 1981, Landon won recognition for his screenwriting with a Spur Award from the Western Writers of America. Although his youngest daughter Jennifer Landon and Bonanza co-star David Canary, have both won multiple Emmys, Michael Landon was never nominated for an Emmy. In 1976, Landon wrote and directed an auto-biographical movie, The Loneliest Runner, which was nominated for two Emmys.
Debra Lee Blocker
Dan Blocker (December 10, 1928 – May 13, 1972) was an American television actor and Korean War veteran. He is best remembered for his role as Eric "Hoss" Cartwright in the NBC western television series Bonanza.
Entertainment is a form of activity that holds the attention and interest of an audience, or gives pleasure and delight. It can be an idea or a task, but is more likely to be one of the activities or events that have developed over thousands of years specifically for the purpose of keeping an audience's attention. Although people's attention is held by different things, because individuals have different preferences in entertainment, most forms are recognisable and familiar. Storytelling, music, drama, dance, and different kinds of performance exist in all cultures, were supported in royal courts, developed into sophisticated forms and over time became available to all citizens. The process has been accelerated in modern times by an entertainment industry which records and sells entertainment products. Entertainment evolves and can be adapted to suit any scale, ranging from an individual who chooses a private entertainment from a now enormous array of pre-recorded products; to a banquet adapted for two; to any size or type of party, with appropriate music and dance; to performances intended for thousands; and even for a global audience.
The experience of being entertained has come to be strongly associated with amusement, so that one common understanding of the idea is fun and laughter, although many entertainments have a serious purpose. This may be the case in the various forms of ceremony, celebration, religious festival, or satire for example. Hence, there is the possibility that what appears as entertainment may also be a means of achieving insight or intellectual growth.
In journalism, a human interest story is a feature story that discusses a person or people in an emotional way. It presents people and their problems, concerns, or achievements in a way that brings about interest, sympathy or motivation in the reader or viewer.
Human interest stories may be "the story behind the story" about an event, organization, or otherwise faceless historical happening, such as about the life of an individual soldier during wartime, an interview with a survivor of a natural disaster, a random act of kindness or profile of someone known for a career achievement.