Actress Jamie-Lynn Sigler has been plunged into mourning following the death of her older brother.

Stockbroker Adam Sigler recently suffered a brain haemorrhage and fell into a coma, before passing away on Wednesday (12Nov14).

The Sopranos star, 33, paid tribute to her eldest sibling on Tuesday (11Nov14), when Adam was still unconscious, by changing her Facebook.com profile picture to an image of the pair during happier times.

She did not share any further information and has yet to comment on the sad loss.

A source tells Usmagazine.com, "Adam was always so happy and inspired Jamie to be a better person every day.

"She loved him dearly and will miss him more than anyone can ever imagine. The family was with him every second he was in a coma and he was surrounded by his entire family when he passed."

Another insider adds, "He was engaged. He was such a funny, amazing man. He was an incredible uncle who was loved by all his friends and family. He will be greatly missed."