I Know This Much Is True (2020) featured a cast of 79 tracked actors. Of these, 29 (97%) are still alive today and 1 have passed away. The oldest surviving cast member is Joseph Ragno, age 90. This TV series starred Mark Ruffalo and Melissa Leo.
97% still with us· verified cast37% of full cast · incl. 49 unverified
Survivorship
Cast Reunion Index: 97% still living
Avg. Age at Death: 87 yrs
Deaths by Year
2025
Cast79 members
| Person | Character | Status | DOB | Age | DOD | Age in 2020 |
|---|---|---|---|---|---|---|
 Mark Ruffalo Dominick Birdsey / Thomas Birdsey | Dominick Birdsey / Thomas Birdsey | Living | 22/11/1967 | 58 | — | 53 |
 Melissa Leo Concettina Ipolita Tempesta 'Ma' Birdsey | Concettina Ipolita Tempesta 'Ma' Birdsey | Living | 14/09/1960 | 66 | — | 60 |
 Rosie O'Donnell Lisa Sheffer | Lisa Sheffer | Living | 21/03/1962 | 64 | — | 58 |
 Archie Panjabi Dr. Patel | Dr. Patel | Living | 31/05/1972 | 54 | — | 48 |
 Kathryn Hahn Dessa Constantine | Dessa Constantine | Living | 23/07/1973 | 53 | — | 47 |
 John Procaccino Ray Birdsey | Ray Birdsey | Living | 01/01/1952 | 74 | — | 68 |
 Rob Huebel Leo | Leo | Living | 04/06/1969 | 57 | — | 51 |
 Michael Greyeyes Ralph Drinkwater | Ralph Drinkwater | Living | 04/06/1967 | 59 | — | 53 |
 Gabe Fazio Shawn Tudesco / Dominick and Thomas Acting Double | Shawn Tudesco / Dominick and Thomas Acting Double | Unverified | — | — | — | — |
 Harris Yulin Father Lavie | Father Lavie | Deceased | 05/11/1937 | 87 | 10/06/2025 | 83 |
 Bruce Greenwood Dr. Hume | Dr. Hume | Living | 12/08/1956 | 70 | — | 64 |
 Marcello Fonte Domenico Onofrio Tempesta | Domenico Onofrio Tempesta | Living | 07/09/1978 | 48 | — | 42 |
 Sue Jean Kim Dr. Yup | Dr. Yup | Unverified | — | — | — | — |
 Michael Simon Hall Stuart Feinstein | Stuart Feinstein | Unverified | — | — | — | — |
 Gina Costigan Mrs. O'Meara | Mrs. O'Meara | Unverified | — | — | — | — |
 Steven Cox Boyfriend of Dr. Hume's Daughter | Boyfriend of Dr. Hume's Daughter | Unverified | — | — | — | — |
 MorningStar Angeline Nabby Drinkwater's Wife | Nabby Drinkwater's Wife | Unverified | — | — | — | — |
Al Linea Abruzzi | Abruzzi | Unverified | — | — | — | — |
Richard Fitch Mill Foreman | Mill Foreman | Unverified | — | — | — | — |
 Amy Lynn Stewart Merciful Mother | Merciful Mother | Unverified | — | — | — | — |
 Guillermo Díaz Sergeant Mercado | Sergeant Mercado | Living | 22/03/1975 | 51 | — | 45 |
 Marylouise Burke Librarian | Librarian | Living | 20/01/1941 | 85 | — | 79 |
| Al | Living | 01/06/1963 | 63 | — | 57 | |
 Sandra Berrios Social Worker at Hatch | Social Worker at Hatch | Unverified | — | — | — | — |
 Laura Silverman Kristin | Kristin | Living | 10/06/1966 | 60 | — | 54 |
 Christine Parks Humanities Department Chair | Humanities Department Chair | Unverified | — | — | — | — |
Morgan Sullivan Office Buddy | Office Buddy | Unverified | — | — | — | — |
 Jake Robards Landlubbers (voice) | Landlubbers (voice) | Unverified | — | — | — | — |
 Michael Genet Thomas' Surgeon | Thomas' Surgeon | Living | 25/08/1958 | 68 | — | 62 |
María Gonzalez Ma's Oncology Nurse | Ma's Oncology Nurse | Unverified | — | — | — | — |
 A.C. Peterson Gene Diogenes | Gene Diogenes | Unverified | — | — | — | — |
| Thad | Living | 18/03/1976 | 50 | — | 44 | |
 James Quattrochi Bus Driver | Bus Driver | Living | 19/06/1961 | 65 | — | 59 |
Rachel B. Joyce Jeanette | Jeanette | Unverified | — | — | — | — |
Paul Coleman Support Group Counselor | Support Group Counselor | Unverified | — | — | — | — |
 Brandon J. Dirden Kyle's Dad | Kyle's Dad | Unverified | — | — | — | — |
 Katt Masterson Doreen | Doreen | Unverified | — | — | — | — |
 Jason Furlani Larry Penn | Larry Penn | Unverified | — | — | — | — |
Annie Fitzgerald Miss Hanker | Miss Hanker | Unverified | — | — | — | — |
 Kate Grimes English Professor | English Professor | Unverified | — | — | — | — |
 Joseph Ragno Henrey Rood | Henrey Rood | Living | 11/03/1936 | 90 | — | 84 |
Acahkos Johnson Penny Ann Drinkwater | Penny Ann Drinkwater | Unverified | — | — | — | — |
 Jaiden Klein Marie Sexton | Marie Sexton | Unverified | — | — | — | — |
 Charlie Reina Channy | Channy | Unverified | — | — | — | — |
Violet Adams Bunny Borsa | Bunny Borsa | Unverified | — | — | — | — |
Oliver Patnode Otero | Otero | Unverified | — | — | — | — |
 Chelsea Sheets Brunette | Brunette | Unverified | — | — | — | — |
 Matt Helm Young Leo | Young Leo | Unverified | — | — | — | — |
 Felix Solis Nurse | Nurse | Living | 17/09/1971 | 55 | — | 49 |
 Laura Esterman Ruth Hood | Ruth Hood | Unverified | — | — | — | — |
 Joe Grifasi Steve Falice | Steve Falice | Living | 14/06/1944 | 82 | — | 76 |
 Derek Goh 17-19 Year Old Dominick & Thomas Acting Double | 17-19 Year Old Dominick & Thomas Acting Double | Unverified | — | — | — | — |
| Omar | Unverified | — | — | — | — | |
 Simone Coppo Vincenzo Tempesta | Vincenzo Tempesta | Unverified | — | — | — | — |
 Sean Cullen Dr. Yates | Dr. Yates | Living | 09/05/1960 | 66 | — | 60 |
 Federico Dordei Nunzio Tucci | Nunzio Tucci | Living | 09/06/1975 | 51 | — | 45 |
 Agatha Nowicki Angie Constantine | Angie Constantine | Unverified | — | — | — | — |
 Rocco Masihi Young Thomas Birdsey | Young Thomas Birdsey | Unverified | — | — | — | — |
 Irene Muscara Prosperina Tucci | Prosperina Tucci | Unverified | — | — | — | — |
Adrienne R. Williams Mrs. Birdsall | Mrs. Birdsall | Unverified | — | — | — | — |
 Shannon Plumb Charlotte | Charlotte | Unverified | — | — | — | — |
 Tatanka Means Nabby Drinkwater | Nabby Drinkwater | Living | 19/02/1985 | 41 | — | 35 |
 Donnie Masihi Young Dominick Birdsey | Young Dominick Birdsey | Unverified | — | — | — | — |
Zaria Degenhardt 11 Year Old Concettina | 11 Year Old Concettina | Unverified | — | — | — | — |
Mark A. Gamma Mourner Mark | Mourner Mark | Unverified | — | — | — | — |
 Wayne J. Miller Mourner Wayne | Mourner Wayne | Unverified | — | — | — | — |
 Thomas Gionet-Lavigne Ray's Orderly | Ray's Orderly | Unverified | — | — | — | — |
Alexander Hacker Templeton | Templeton | Unverified | — | — | — | — |
Robert Mladinich Paddy Wagon Officer | Paddy Wagon Officer | Unverified | — | — | — | — |
 Philip Ettinger Early Adulthood Dominick Birdsey / Thomas Birdsey | Early Adulthood Dominick Birdsey / Thomas Birdsey | Living | 08/09/1985 | 41 | — | 35 |
 Aisling Franciosi Young Dessa Constantine | Young Dessa Constantine | Living | 06/06/1993 | 33 | — | 27 |
 Destry Allyn Spielberg Dr. Hume's Daughter | Dr. Hume's Daughter | Living | 01/12/1996 | 29 | — | 24 |
 Imogen Poots Joy Hanks | Joy Hanks | Living | 03/06/1989 | 37 | — | 31 |
 Roberta Riganò Ignazia Tempesta | Ignazia Tempesta | Unverified | — | — | — | — |
 Juliette Lewis Nedra Frank | Nedra Frank | Living | 21/06/1973 | 53 | — | 47 |
Tim Ruddy Robocop | Robocop | Unverified | — | — | — | — |
 Ethan Crystal Thin Sailor | Thin Sailor | Living | 06/07/1993 | 33 | — | 27 |
James Pravasilis Third Guard | Third Guard | Unverified | — | — | — | — |
| Fatso | Unverified | — | — | — | — |
