Info derived from imdb. Only roles 2013-on being tracked. Only actors in 5+ episodes noted. If no character name noted, they played no character more than once or twice.
Ricardo Montalban (Mr. Roarke): died in 2009.
Hervé Villechaize (Tattoo): died in 1993.
Christopher Hewett (Lawrence): died in 2001.
Wendy Schaal (Julie): in American Dad! (194 episodes 2005-2016), Family Guy (1 episode 2013); as Self: 2015 Creative Arts Emmys (2015), There Goes the Neighborhood: The Making of 'The 'Burbs' (2014), Good Day L.A. (1 episode 2013).
Carol Lynley: last known acting role in 2006, as Self in 2006.
Dennis Cole: died in 2009.
Barbi Benton: last known acting role in 1986; as Self: Q N' A with Mikki and Shay (1 episode 2014).
Phyllis Davis: died in 2013.
Mary Ann Mobley: died in 2014.
Ken Berry: last known acting role in 1999, as Self in 2006.
Stuart Whitman: last known acting role in 2000, as Self in 2011.
Michelle Phillips: last known acting role in 2011; as Self: Classic Hollywood Cinemas (2015), The Sixties (2 episodes 2013), American Masters (1 episode 2013); as Self, post-production: Good Fortune (2016).
George Maharis: last known acting role in 1993, as Self in 1994.
John Saxon: in The Extra (2016), The Dentros (2015), Roger (2014); Bring Me the Head of Lance Henriksen (nd) in post-production; After the Thunderstorm (2016) in pre-production.
John Myhers: died in 1992.
David Hedison: last known acting role in 2005; as Self: The Green Girl (2014).
Maureen McCormick: in Nightmare Next Door (1 episode 2016), Naughty and Nice (2014); Big Baby (2015) completed; Accidental Engagement (2016) in post-production; as Self: I'm a Celebrity, Get Me Out of Here! (1 episode 2015).
Dack Rambo: died in 1994.
Danielle Aubry: last known acting role in 2006.
Lisa Hartman: last known acting role in 2012; as Self: Entertainment Tonight (1 episode 2015).
Hugh O'Brian: last known acting role c2000 but Old Soldiers (2016) in pre-production; as Self in 2010.
Jayne Meadows: died in 2015.
Michael Callan: last known acting role in 2006, as Director/Producer in 2007.
Jack Carter: died in 2015; Mercy (2014), Shameless (1 episode 2014), Go On (1 episode 2013), Rules of Engagement (1 episode 2013); as Self: When Jews Were Funny (2013).
Peter Graves: died in 2010.
Lynda Day George: last known acting role in 1989, as Self in 2001.
Georgia Engel: in Hot in Cleveland (13 episodes 2013-2015), Grown Ups 2 (2013); The Telling (nd) in pre-production; as Self: Katie (1 episode 2013).
Roddy McDowall: died in 1998.
Alex Cord: last known acting role in 2009.
Ron Ely: in Expecting Amish (2014); last previous known acting role in 2001; Mesopotamia (2018) in pre-production.
Audrey Landers: in Dallas (2 episodes 2013-2014); Water Lords (2013) completed.