The actor was best known for playing Stanford Blatch, close friend of Carrie Bradshaw in Sex And The City and Mozzie in Police Drama White Collar.
Garson's death was confirmed by his son Nathen, who paid tribute to his father via Instagram.
He wrote, "I love you so much papa. Rest In Peace and I’m so glad you got to share all your adventures with me and were able to accomplish so much".
"I’m so proud of you. I will always love you, but I think it’s time for you to go on an adventure of your own. You’ll always be with me. Love you more than you will ever know and I’m glad you can be at peace now".
"You always were the toughest and funniest and smartest person I’ve known. I’m glad you shared you’re love with me. I’ll never forget it or lose it".
It has since emerged that weeks before his death, Garson posted this emotional and touching message via his Twitter account.
"BE KIND TO EACH OTHER......ALWAYS. LOVE TO ALL. APRROACH KINDNESS", he wrote.