CSP Inc. announced Monday the sudden passing of chairman, president, and chief executive Alexander R. Lupinetti, 67.

He died Sunday, a company spokesman said.

Victor Dellovo, 43, president of the company’s Modcomp subsidiary, has been appointed by the the company’s board of directors to serve as CSP’s interim president and chief executive, CSP said in a press release.

Based in Billerica, CSP and its subsidiaries develop and market IT integration solutions and high-performance computer systems to meet the diverse requirements of industrial, commercial, and defense customers worldwide.

Lupinetti had been chief executive and president since October 1996. The CSP board has not yet appointed a successor chairman, the company said.

“During his 16 years as CSP’s president and CEO, Alex transformed CSP from a single-product organization to a much larger company with wide-ranging sales opportunities and the potential for accelerated profitable growth,” CSP director C. Shelton James said in a statement. “We are forever indebted to Alex for his commitment and dedication to CSP. The board of directors and everyone at CSP offer our condolences to Alex’s family and friends.”