ST. PAUL — The founder of Starkey Hearing Technologies declined to comment Wednesday on reports of a senior leadership shake-up, citing an ongoing investigation at the hearing aid giant.

Company President Jerry Ruzicka and three senior executives were fired, citing an internal email it obtained. Ruzicka, Chief Financial Officer Scott Nelson, Senior Vice President of Operations Keith Guggenberger and Senior Vice President of Human Resources Larry Miller were fired effective immediately, according to the email.

All four executives’ names were absent from the company’s website Wednesday afternoon.

Ruzicka referred a request for comment to his attorney, Marshall Tanick.

“We’re looking into the matter and hope it can be resolved fairly and amicably,” Tanick said, adding that he was aware of a document the company sent out saying that Ruzicka and three others were let go. He declined further comment.