The 74 year old has died after being taken to hospital.
Mohammad Asghar, Conservative Senedd member for South Wales East - was the first ever BAME member of the Senedd and served for more than 13 years.
His daughter Natasha has led the tributes on Twitter saying: "Today by far has been the worst day of my life. I lost the first man I ever loved forever💔 @MohammadAsghar The man who taught me to walk,crack terrible jokes,do whatever I had to to achieve my goals & do anything for ones family. I cannot imagine life without you.I Love you ❤️
Secretary of State for Wales Simon Hart said: "As both Wales’ first Muslim councillor and first ethnic minority member of the Senedd, Mohammad Asghar was an extremely significant figure in Welsh politics and has contributed so much to his community and the country since settling here as a young man.
“His loss is terrible news. He will be fondly remembered and I would like to pay my condolences to Mohammad’s family, friends and constituents."
So very sorry to hear of the sad loss of Oscar. He was the most loyal friend, colleague & campaigner but above all he was a family man. The love, pride & joy he shared with his wife, Firdaus & daughter, Natasha were obvious for everyone to see. My thoughts & prayers are with them— Alun Cairns (@AlunCairns) June 16, 2020
Commenting on the death of Mohammad Asghar MS, the Member of the Welsh Parliament for South Wales East, Leader of the Welsh Conservatives in the Welsh Parliament, Paul Davies MS, said: "This news is a devastating blow to the Conservative Group in the Welsh Parliament.
"Our friend and colleague, Mohammad Asghar – known to many as ‘Oscar’ – has served the people of South Wales East in the Senedd with distinction for more than 13 years.
"Proud to be British and Welsh and proud of his roots, Oscar had friends from across the political spectrum, and made his mark on Welsh history as the first-ever BAME Member of the Senedd.
"I am sure that everyone will join me in sending condolences to his family ,especially his wife Firdaus and his daughter Natasha, both of whom he loved dearly, at their tragic time of loss."