The Sopranos and Entourage alum Jamie-Lynn Sigler and her family are mourning the death of her brother, Adam Sigler, who passed away suddenly this week at age 41.
Adam was eight years older than the actress and lived in New York, where he and his siblings grew up. The cause of his death was not revealed. Jamie-Lynn and her family have not commented. A friend of the actress told E! News that Adam was in a coma when he died.