Patty Duke Through The Years

American actress Patty Duke taking a break from filming on the set of 'Valley of the Dolls' on April 24, 1967. (Photo by Harry Benson/Express/Hulton Archive/Getty Images)

Patty Duke At The 7th Annual Screen Actors Guild Awards

Actress Patty Duke attends the 7th Annual Screen Actors Guild Awards March 11, 2001 at the Shrine Auditorium in Los Angeles, CA. (Photo by Jason Kirk/Newsmakers)

Patty Duke At 20th Annual Media Access Awards

Actress Patty Duke attends the 20th Annual Media Access Awards at the Sheraton Universal Hotel on November 2, 2002 in Los Angeles, California. The awards honor those companies and individuals who assist in the awareness of disability in the entertainment industry. (Photo by Robert Mora/Getty Images)

Patty Duke At The 76th Annual Macy's Thanksgiving Day Parade

Patty Duke and the cast of Oklahoma! perform at the 76th Annual Macy's Thanksgiving Day Parade in Herald Square November 28, 2002 in New York City. (Photo by Matthew Peyton/Getty Images)

Patty Duke At The 7th Annual Erasing The Stigma Leadership Awards

Actress Patty Duke speaks at the Seventh Annual Leadership Awards at the Regent Beverly Wilshire Hotel on May 16, 2003 in Beverly Hills, California. The event was sponsored by the Didi Hirsch Community Mental Health Center. (Photo by Frederick M. Brown/Getty Images)

Patty Duke With Her Sons

Actress Patty Duke (C) and sons MacKenzie (L) and Sean Astin attend the ceremony honoring her with a star on the Hollywood Walk of Fame August 17, 2004 in Hollywood, California. (Photo by Vince Bucci/Getty Images)

Patty Duke Gets Star On Walk Of Fame

Actor David Ogden Stiers kisses actress Patty Duke at the ceremony honoring Duke with a star on the Hollywood Walk of Fame August 17, 2004 in Hollywood, California. (Photo by Vince Bucci/Getty Images)

Patty Duke Gets Star On Walk Of Fame

Actress Patty Duke and granddaughters Elizabeth (L) and Alexandra Astin attend a ceremony honoring Duke with a star on the Hollywood Walk of Fame August 17, 2004 in Hollywood, California. (Photo by Vince Bucci/Getty Images)

Patty Duke Gets Star On Walk Of Fame

Actress Patty Duke attends a ceremony honoring her with a star on the Hollywood Walk of Fame August 17, 2004 in Hollywood, California. (Photo by Vince Bucci/Getty Images)

Patty Duke Gets Star On Walk Of Fame

Actress Patty Duke attends a ceremony honoring her with a star on the Hollywood Walk of Fame August 17, 2004 in Hollywood, California. (Photo by Vince Bucci/Getty Images)

Patty Duke At The 2nd Annual TV Land Awards

Actors Barbara Eden (L), Larry Hagman and Patty Duke attend the 2nd Annual TV Land Awards held at The Hollywood Palladium, March 7, 2004 in Hollywood, California. (Photo by Frank Micelotta/Getty Images)

Patty Duke At The 2nd Annual TV Land Awards

Actress Patty Duke poses at the 2nd Annual TV Land Awards held at The Hollywood Palladium, March 7, 2004 in Hollywood, California. (Photo by Frank Micelotta/Getty Images)

Patty Duke With Gary Coleman

Actor Gary Coleman and award winner Actress Patty Duke Astin poses backstage at the 2nd Annual TV Land Awards held on March 7, 2004 at The Hollywood Palladium, in Hollywood, California. (Photo by Frederick M. Brown/Getty Images)

Patty Duke At The 2nd Annual TV Land Awards

Actress Patty Duke Astin receives her award for Favorite Dual-Role on stage at the 2nd Annual TV Land Awards held on March 7, 2004 at The Hollywood Palladium, in Hollywood, California. (Photo by Kevin Winter/Getty Images)

Patty Duke At The 2nd Annual TV Land Awards - Arrivals

Actress Patty Duke-Astin attends the 2nd Annual TV Land Awards held on March 7, 2004 at The Hollywood Palladium, in Hollywood, California. (Photo by Frederick M. Brown/Getty Images)

Patty Duke At The 41st Annual ICG Publicists Awards The 41st Annual ICG Publicists Awards

Actress Patty Duke attends the 41st Annual ICG Publicists Awards on February 27, 2004 at the Beverly Hilton Hotel in Beverly Hills, California. (Photo by Vince Bucci/Getty Images)

Patty Duke At The Creative Coalitions 2004 Capitol Hill Spotlight Awards

Actress Patty Duke laughs while standing with her son Sean Astin and Actress Gabrielle Carteris at the Creative Coalition's 2004 Capitol Hill Spotlight Awards Ceremony on March 30, 2004 in Washington, DC. (Photo by David S. Holloway/Getty Images)

Patty Duke

Actress Patty Duke attends the national premiere of her new Social Security public service announcement at the Paley Center for Media on January 6, 2009 in New York City. (Photo by Scott Gries/Getty Images)

Patty Duke

Actress Patty Duke speaks during the Social Security Administration Reunites the cast of "The Patty Duke Show" press conference at the Paley Center for Media on March 23, 2010 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)

"Patty Duke Show" Cast Reunites

(L-R) Actor Paul O'Keefe, actress Patty Duke and actor Eddie Applegate attend the Social Security Administration Reunites the cast of "The Patty Duke Show" press conference at the Paley Center for Media on March 23, 2010 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)

Patty Duke with George Takei

Actors George Takei (L) and Patty Duke (R) show the 'live long and prosper' sign from the television show 'Star Trek' as they launch a new campaign to help the US Social Security Administration promote its online services April 6, 2011 in New York. (Photo credit Stan Honda/AFP/Getty Images)