Former Welsh government minister Carl Sargeant, who was suspended last week amid allegations about his personal conduct, has died.
Mr Sargeant served as Welsh Assembly Member for Alyn and Deeside since 2003.
Until last week, he was Cabinet Secretary for Communities and Children in the Welsh Government before being sacked from his role and suspended by Labour.
North Wales Police said they are investigating an incident at an address in Connah's Quay, Flintshire.
In a statement, his family said: "Carl was a much loved husband, father and friend.
"He wasn't simply a part of our family. He was the glue that bound us together. He was the heart of our family. We loved him so very much.
"He was the most kind and caring husband, father, son and friend. We are devastated beyond words, and we know our grief will be shared by all those who knew and loved him.
"We are in shock and grief. We ask that our privacy is respected at this time."
Labour leader Jeremy Corbyn said: "This is terrible and deeply shocking news.
"My thoughts and profound sympathy are with Carl's family, friends and colleagues."
Welsh First Minister Carwyn Jones said: "Carl was a friend as well as a colleague and I am shocked and deeply saddened by his death.
"He made a big contribution to Welsh public life and fought tirelessly for those he represented both as a Minister and as a local Assembly Member.
"He will be a great loss both to our party and to the Senedd. My heartfelt sympathies are with his family at this difficult time."
The Welsh Assembly suspended proceedings on Tuesday afternoon following the news.