Thaddeus Farrow was found suffering a self-inflicted gunshot wound in his car last week

By Char Adams
September 26, 2016 07:55 AM

Actress Mia Farrow‘s son Ronan is opening up about the death of his brother Thaddeus just days after he committed suicide.

Ronan, 28, remembered Thaddeus in an Instagram post on Sunday, uploading two throwback shots of his late brother.

“Rest in peace, brother. I never knew anyone stronger, or who overcame more,” Ronan captioned the side-by-side photos.

In the shots, Thaddeus is seen in his younger days, wearing leg braces. In the other, the 27-year-old is seen in a wheelchair.

Thaddeus was found last week “suffering from a life-threatening injury,” inside his vehicle, according to a Connecticut State Police report obtained by PEOPLE.

A medical examiner confirmed to PEOPLE that he committed suicide by shooting himself.

Mia adopted Thaddeus from Calcutta, India, in 1994. He was a paraplegic after contracting polio.

In a statement released on Twitter following the death, Mia wrote that she and her family were “devastated” by the tragedy.

“[Thaddeus] was a wonderful courageous person who overcame so much hardship in his short life,” the mother of 14 wrote.

“We miss him. Thank you for the outpouring of condolences and words of kindness.”

Farrow has 11 living children – four biological and seven adopted – and Thaddeus is the third adopted child the actress has lost.