Thaddeus died of a gunshot wound to the torso on Wednesday. He was 27 years old.
Mia Farrow is "devastated" by the death of her son, Thaddeus Wilk Farrow.
The 71-year-old actress took to Twitter to thank fans for the "outpouring of condolences and words of kindness" she and her family have received following Thaddeus' death on Wednesday.
WATCH: Mia Farrow's Son Thaddeus Dies at 27
"We're devastated by the loss of Thaddeus, our beloved son and brother," she posted on Thursday. "He was a wonderful, courageous person who overcame so much hardship in his short life. We miss him. Thank you for the outpouring of condolences and words of kindness."
"If you or someone you love needs help, or if you want to support a group doing life saving work, please visit https://afsp.org/," she concluded, linking to the American Foundation for Suicide Prevention.
According to the Office of the Chief Medical Examiner in Connecticut, Thaddeus died of a gunshot wound to the torso. His death has been ruled a suicide.
Thaddeus died at Danbury Hospital in Connecticut on Wednesday, after law enforcement officials found him suffering from the life-threatening injury in his car.
The 27-year-old -- who was a paraplegic as a result of suffering from polio -- was adopted by Farrow from Calcutta, India in 1994.
If your or someone you know needs help, please call the National Suicide Prevention Lifeline at 1-800-273-TALK (8255).