Supt. Madeline Negrón (right): No comment on investigation, departure of Tom Lamb. A four-month investigation into the school district’s chief of operations found that none of the allegations of wrongdoing were substantiated.What those allegations were? The superintendent won’t say.That’s the latest with New Haven Public Schools’ (NHPS) former chief operating officer, Tom Lamb.As disclosed in a school district personnel report on Monday, Lamb resigned from his position as the district’s chief of operations effective Oct. 3. He had been on paid administrative leave for undisclosed reasons since May 29.On Wednesday morning, NHPS spokesperson Justin Harmon told the Independent that none of the allegations against Lamb were substantiated. He wouldn’t say what those allegations were, citing legal prohibitions on talking about confidential personnel matters.NHPS Supt. Madeline Negrón offered a similar response when asked about Lamb’s case following the latest Board of Education meeting Tuesday night at John S. Martinez School in Fair Haven. ​“I don’t comment on personnel matters,” she said.“Tom Lamb, as you saw, has resigned,” she continued. ​“I am grateful for the work that he did when he was with us. I wish him well with his future endeavors.” At an unrelated event on Wednesday morning, Negrón was asked why, in contrast, she has commented publicly about the district’s termination of its information technology director, Gildemar Herrera, who is also a president of the municipal union Local 3144. Herrera was fired earlier this year following an investigation into a $6 million theft of public dollars largely meant for the city’s school bus contractor. That investigation found that Herrera allegedly failed in her responsibilities to update the district’s firewall and misrepresented her work, among other professional concerns.Negrón has previously told the Independent that the investigation into Lamb had nothing to do with that $6 million cyberattack.“The two situations have nothing to do with one another,” Negrón said on Wednesday about Lamb’s and Herrera’s cases. ​“People keep trying to connect them … They’re not connected at all.”She concluded that, ​“I’m not going to comment further on those cases.”Laura Glesby contributed to this report.