Though Thomas Rukavina, a former PPG Industries chemist accused in federal court in Pittsburgh with theft of trade secrets has committed suicide, the case into the matter continues, according to U.S. Attorney David Hickton.

“U.S. Attorney David Hickton in Pittsburgh said the FBI will continue to spearhead the spy probe but couldn’t be more specific due to the ‘sensitive nature’ of the case,” according to a local report.

Rukavina was charged in early May after an investigation by the FBI, according to a statement by the Justice Department.

The criminal complaint alleges that Rukavina retired from PPG in July 2012, and as early as June 2014, he “passed propriety and confidential information to J.T.M.G. Co., a glass company based in Jiangsu, China, that specializes in automotive and other specialty glass.”

“The trade secret information he passed included PPG’s manufacturing specifications for windows, which are made of synthetic plastics and used for high-speed transportation, including airplanes,” according to a statement from the U.S. Justice Department.