US Attorney Says ex-CT Official Deserves Prison
Former Connecticut state official Konstantinos “Kosta” Diamantis is facing a major sentencing showdown after federal prosecutors asked a judge to impose 12 years and seven months in prison for a corruption scheme involving school-construction contractors. Diamantis, 70, was convicted last year on 21 federal counts, including bribery, extortion, conspiracy and making false statements to federal investigators. His sentencing is scheduled for Sept. 17 before U.S. District Judge Stefan Underhill in Bridgeport.
The case centers on Diamantis’ tenure as director of Connecticut’s Office of School Construction Grants and Review, the state agency responsible for administering grants for public-school construction projects. Prosecutors said he exploited that position to pressure contractors seeking or maintaining lucrative state-funded projects. The government’s case was that Diamantis demanded and accepted payments in exchange for favorable treatment, including helping contractors secure contracts and avoid losing existing work.
The conduct underlying the conviction occurred primarily between 2018 and 2021. According to prosecutors, Diamantis received more than $75,000 through the scheme. One contractor, Construction Advocacy Professionals owner Antonietta Roy, testified that she hired Diamantis’ daughter for an administrative position paying $45 an hour after fearing that her company could lose government contracts. Roy also acknowledged providing Diamantis with $4,500 in checks and cash.
Another important piece of the prosecution’s evidence came from John Duffy, Diamantis’ former brother-in-law and a vice president of Acranom Masonry. Duffy testified that the company’s successful bid on a project effectively included a $70,000 payoff for Diamantis. Several executives connected to companies involved in the scheme had already pleaded guilty and testified against him.
A federal jury ultimately rejected Diamantis’ defense and convicted him on 21 counts in October 2025. That conviction is an established legal finding, rather than the government’s current allegation. The sentencing dispute now concerns how much punishment is appropriate, not whether the jury found him guilty.
Prosecutors are asking for a sentence at the upper end of the federal sentencing-guidelines range. Their sentencing memorandum describes Diamantis as a calculating official who betrayed public trust and argues that the seriousness of the corruption warrants substantial imprisonment. The government’s requested 12-year, seven-month sentence falls within the advisory guideline range prosecutors identified as 121 to 151 months.
Diamantis’ lawyers are seeking essentially the opposite outcome: no prison time. Attorney Norm Pattis has asked for home detention and maximum probation, arguing that his 70-year-old client has already suffered substantial consequences, including financial losses, the loss of his professional status and diminished employment prospects. The proposed sentence would include restrictions on future government employment and contracting, financial monitoring, restitution where appropriate and a prohibition on profiting from the crimes.
The sentencing judge will therefore have to weigh the seriousness of the corruption against the mitigating circumstances offered by the defense. The prosecution emphasizes deterrence, the abuse of public authority and the impact on confidence in government contracting. The defense emphasizes age, health, nonviolence, financial ruin and the argument that another decade behind bars would provide little additional sentencing value.
The case also has a significant second chapter. Diamantis faces another federal corruption case involving allegations that he accepted payments to interfere with a state investigation into a Bristol eye-care practice accused of health-care fraud. Prosecutors allege that Diamantis received approximately $100,000 to help derail the investigation. Those accusations are separate from the school-construction convictions and have not resulted in a conviction against him. His second trial is expected later, with earlier scheduling changes having pushed the proceeding back.
That distinction is important because the current sentencing is based on the school-construction corruption convictions, while the eye-care investigation allegations remain a separate criminal matter. Treating the two as if they were one conviction would overstate the legal status of the second case.
Diamantis has also sought a presidential pardon from President Donald Trump. Federal records reportedly show a pending application seeking a pardon after completion of sentence. The application adds a political dimension to an otherwise conventional federal sentencing dispute, particularly because a pardon could have consequences for Diamantis’ ability to retain certain benefits, including his state pension.
The sentencing is thus more than a question of how long one former official will spend in prison. The case represents a test of how federal courts punish corruption involving the allocation of public construction money and whether a former official who used governmental authority for personal benefit should receive a substantial custodial sentence despite his age and personal circumstances.
For Connecticut, the case is also a prominent example of the risks surrounding public procurement. School construction projects involve millions of dollars in public money, and the government’s theory was that Diamantis exploited the state’s contracting system by making private financial interests part of decisions that should have been governed by public responsibilities. His eventual sentence could become an important benchmark for accountability in future public-corruption cases.
Key Legal Outcome
- Diamantis was convicted on 21 federal counts involving bribery, extortion, conspiracy and false statements after his 2025 jury trial.
- Federal prosecutors are seeking 12 years and seven months in prison, citing an advisory guideline range of 121 to 151 months.
- The defense is requesting no prison time, instead seeking home detention and maximum probation with extensive restrictions and monitoring.
- Sentencing is scheduled for Sept. 17, 2026, before U.S. District Judge Stefan Underhill.
- Diamantis’ separate corruption case remains unresolved and should not be treated as an additional conviction; prosecutors accuse him of trying to interfere with a state health-care fraud investigation.
Why It Matters
- It tests how severely courts punish corruption involving public contracts.
- The case involves millions of dollars in taxpayer-funded school construction.
- It highlights the consequences of abusing government contracting authority.
- The sentence could become a significant Connecticut public-corruption benchmark.
- A pending pardon request adds another layer to the case’s political significance.
