According to TMZ, Thaddeus passed away at the Danbury Hospital in Connecticut.
It’s being reported he died from injuries sustained in a car accident however an exact cause of death is yet to be confirmed.
“He died from a life-threatening injury he suffered in his car… and there was no foul play,” a police statement read.
Mia adopted Thaddeus in 1994 from an orphanage in Calcutta, India following her divorce from Woody Allen.
Thaddeus, who is one of ten children the star has adopted, was wheelchair-bound after suffering from polio.
Back in 2013, Thaddeus spoke to Vanity Fair about his upbringing. “It was scary to be brought to a world of people whose language I did not understand, with different skin colours,” he explained to the publication.
“The fact that everyone loved me was a new experience, overwhelming at first.”
WATCH: Ronan Farrow talks growing up in a large family. Post continues after the video…
Thaddeus was studying to become a police officer and worked as a car mechanic.
Mia’s adopted daughter Soon-Yi famously fell in love with Woody Allen and the pair married in 1997.
Woody has since been estranged from the family. In 1992, Mia claimed Woody had sexually assaulted her adopted daughter Dylan however the actor/director has always denied the allegations and has never been charged.
WATCH: Woody Allen denies sexual assault claims. Post continues after the video…
Woody’s son Ronan once remarked of the scandal, “He’s my father married to my sister. That makes me his son and his brother-in-law. That is such a moral transgression.”
This is the third adopted child of Mia’s to pass away. Her daughter Tam Farrow died from heart failure in 2000 when she was just 19. In 2008, her other daughter Lark Previn passed away at the age of 35 after a long illness.
The mother-of-14 also has four biological children, including Ronan.
In the past, Ronan has praised his mother for using her wealth to help those less fortunate in the world by adopting them.
“I am so proud of my family. I grew up across the table from Moses, who has cerebral palsy, and next to my sister Quincy, born of a drug-addicted inner-city mother, and Minh, who is blind.”
“I could never have understood what it means to grow up blind or with cerebral palsy. I saw problems and needs, so the next thing you think is: OK, what are you going to do about it?” Ronan explained.