(written from a Production point of view)
Dawn Roddenberry Compton (born 31 August 1953; age 59) is the daughter of Star Trek creator Gene Roddenberry. She played a blonde girl in the Star Trek: The Original Series episode "Miri", but received no credit for her appearance.
Roddenberry was born Dawn Alison Roddenberry in Los Angeles, California during her father's first marriage with Eileen Anita Rexroat. Her older sister Darleen passed away in 1995. She has a half-brother from her father's second marriage with Majel Barrett, Eugene "Rod" Roddenberry, Jr. In 1977, she married Richard (Meilicke) Compton, and was married to him until his death in 1994. Richard Compton was also survived by his five children, Norman Eugene Stevens, Linda Joyce Meilicke, Carolyn Stevens Nelson, Richie Stevens Grant, and Richard H. Compton (Stevens). All his children except for Linda were adopted by their mother's second husband, George W. Stevens, brother of Ted Stevens, Senator of Alaska.
Alongside TOS star James Doohan and TOS guest star William Campbell, she was a nameless girl in the 1971 erotic B-movie Pretty Maids all in a Row, also written by her father. Nichelle Nichols' son Kyle Johnson also appeared in that movie.
Roddenberry made news for attempting to sue her stepmother, Majel Barrett, for mismanaging her father's affairs in his ailing days, but withdrew the suit the day before it was set to go to court. 
Dawn attended at least her ninth grade school year (1968/1969) at Emerson Jr. High, according to former schoolmate, Rev. Peggy Pearl-Kirkby (6 April 2009), during which time she resided with her mother.