“Why Don’t You Just Shut the Hell Up?”: Convicted Surgeon Explodes at Prosecutor as He Faces Possible Death Sentence

A convicted plastic surgeon erupted in anger during a Florida court hearing, accusing a prosecutor of acting with an “evil heart” and demanding that the attorney stop interfering in his case. Tomasz Kosowski, 47, who represented himself during his murder trial, returned to court on October 8 for a critical hearing that could help determine whether he will receive the death penalty or spend the rest of his life in prison. Rather than present evidence in his own defense, Kosowski used part of the hearing to challenge the prosecution’s handling of his case, triggering a heated exchange that underscored the increasingly tense proceedings.

Kosowski was convicted of first-degree murder in the death of Steven Cozzi, a 41-year-old attorney who disappeared in March 2023. Cozzi had represented clients involved in a civil dispute with Kosowski, who was also acting as his own attorney in that case. Prosecutors argued that the legal conflict had become personal and presented evidence they said linked Kosowski to Cozzi’s disappearance and killing. Although investigators never recovered Cozzi’s remains, the judge concluded that the evidence presented at trial established that Kosowski had murdered him.

According to the prosecution, Cozzi was killed inside a bathroom at the law firm where he worked. Investigators found blood inside the restroom, including evidence of cleaning efforts that prosecutors said appeared intended to remove traces of the crime. Surveillance footage and other evidence were used to reconstruct what allegedly happened next: prosecutors said a man matching Kosowski’s description left the building pushing a heavy cart, then loaded it into a pickup truck. They alleged that Cozzi’s body was transported away and ultimately disposed of at a landfill. The remains have never been found.

The case drew widespread attention because of the disturbing evidence described in court and Kosowski’s decision to act as his own lawyer. Prosecutors presented surveillance footage, DNA findings, cellphone records and witness testimony to support their case. They also described items allegedly found during the investigation, including equipment and substances they argued were relevant to the suspected plan. Kosowski repeatedly disputed the prosecution’s account, questioning how one person could have moved a body weighing approximately 195 pounds and arguing that the state’s reconstruction of events was physically implausible. The judge ultimately rejected his arguments and found him guilty in September 2026.

At the October hearing, known as a Spencer hearing, Kosowski was given a final opportunity to present mitigating information before the judge decides his sentence in a death penalty case. He declined to offer any evidence on his own behalf, but raised concerns about recordings of conversations between himself and his mother that had been shared with his former defense team. Kosowski suggested that prosecutors had used those recordings to damage his relationship with his previous attorney, Bjorn Brunvand, who withdrew from the case in 2025. He accused prosecutor Nathan Vonderheide of acting in bad faith, describing him as a man speaking from an “evil heart” and alleging that he was trying to undermine the attorney-client relationship.

When Kosowski continued criticizing the prosecutor, he delivered the blunt rebuke that became the hearing’s most striking moment: “If you didn’t want it to happen, then why don’t you just shut the hell up?” Vonderheide defended his actions, explaining that the recordings had been provided to the defense to prevent later claims that Kosowski had received ineffective legal representation. Judge Joseph Bulone rejected Kosowski’s request to review the communications, denying another attempt by the defendant to challenge how the prosecution had handled the case.

Because Kosowski refused to present mitigating evidence, the judge appointed special counsel John Nohlgren to offer information that might weigh against a death sentence. Nohlgren described Kosowski’s educational and professional background, noting that he emigrated from Poland as a child, studied music and biochemistry, attended Dartmouth Medical School and earned an MBA. He also highlighted Kosowski’s research and medical publications, arguing that his contributions to medicine should be considered when the court determines his punishment. Nohlgren acknowledged that Kosowski’s medical career was over, but urged the judge to consider whether he could still contribute positively to life inside prison.

The hearing ended without a sentence being announced. Judge Bulone scheduled Kosowski’s sentencing for November 20, 2026. Prosecutors are seeking the death penalty, while the judge will have to weigh the circumstances of the murder alongside any mitigating information presented during the penalty phase. For Cozzi’s family and loved ones, the case has already brought years of uncertainty, as his body remains missing despite extensive searches. The upcoming hearing will determine the punishment for a crime the court has found Kosowski committed, bringing the case closer to its final legal chapter.

Sources: Court TV and FOX 13 News