Also, they called on the Nigerian Ministry of Foreign Affairs and relevant agencies in the country to join in the investigation.
Wigwe, alongside his wife and son died in a helicopter crash in California near the Nevada border, US.
Leader of the caucus, Dunamenne Dekor, made the call in a statement he made available to journalists in Port Harcourt, Rivers State capital on Monday.
The statement read, “Our hearts are heavy with sorrow as we extend our deepest condolences to the Wigwe family and loved ones during this distressing time.
“Dr Herbert Wigwe played a prominent role in the financial banking community, education and welfare.
“His leadership at Access Holdings Plc has left an indelible mark on the industry.
“As we mourn the loss of our son; a nationalist, lover of Rivers State, and visionary and compassionate leader, we take solace in the very remarkable impact he made in the financial sector, education, and particularly his philanthropic lifestyle and belief that the well-being of a people is the only thing that has intrinsic value.
“The Caucus is calling on the United States of America and its relevant agencies, the Nigerian Minister of Foreign Affairs, and all relevant institutions and agencies of government to thoroughly investigate the cause of this ill-fated helicopter crash in California and make public its findings.
“We fervently hope that the authorities will successfully locate and provide the necessary support to the families of the victims of this devastating incident.
“Our thoughts and prayers are with the Wigwe family and all those who have been impacted by this tragic event.”