CLEVELAND, OH — A former software developer who secretly planted a “kill switch” inside his employer’s network—crippling systems and locking out thousands of users worldwide—was sentenced Wednesday to four years in federal prison.

Davis Lu, 55, a Chinese national legally residing in Houston, was convicted earlier this year of causing intentional damage to protected computers after he unleashed malicious code on his former employer, a Beachwood, Ohio-based company. The attack followed a corporate restructuring that slashed Lu’s access and responsibilities, triggering a campaign of digital sabotage.

Federal prosecutors revealed that Lu spent months building a trap inside the company’s systems. His code created infinite loops to crash servers, wiped employee profile files, and included a “k

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