A Sonoma County judge has signed off on mental health diversion for a former City of Santa Rosa staffer accused in a violent kidnapping and assault, a move that keeps him out of jail and has reignited local debate over when treatment should take the place of incarceration. Judge Karlene Navarro granted the diversion earlier this month for defendant Nicholas Calabrese, putting him on a two-year, court-supervised treatment plan that could ultimately wipe out his felony charges. Calabrese is facing more than a dozen felony counts, including kidnapping, criminal threats and assault with a deadly weapon.
According to The Press Democrat, prosecutors say Calabrese was arrested on Aug. 1, 2025, after an incident in which the victim was held captive and assaulted with a knife, a belt buckle, a metal cup and fists. The victim was treated at a Santa Rosa area hospital for a fractured nose, head lacerations, bruising and a broken rib. The outlet also reports that Calabrese had worked for the city as a civil engineering technician until November 2025.
Prosecutor Objects, Judge Approves Diversion
Deputy District Attorney Robert Blade tried to block diversion back in April, arguing that traditional prosecution was the only reasonable response to what he characterized as extreme violence. In a written motion, he contended that a two-year term of mental health treatment is not reasonable to resolve the defendant's extreme capacity for deadly violence, as reported by The Press Democrat.
Two separate evaluators agreed Calabrese has a history of mental illness, but they split on a key legal question: whether that illness was directly tied to the alleged crimes. After weighing those opinions, Navarro concluded that he met the statutory requirements for diversion and laid out conditions for treatment and monitoring instead of pushing the case straight to trial.
How Mental Health Diversion Works Under State Law
Under California law, mental health diversion lets certain defendants step out of the usual criminal track and into supervised treatment, with the possibility that their pending charges are dismissed if they successfully complete the program. The court is responsible for approving the plan, overseeing treatment and checking compliance, according to Sonoma County Superior Court.
This year, Gov. Gavin Newsom signed Assembly Bill 46, which narrows judges' discretion by directing them to weigh whether an outpatient diversion plan would endanger public safety. The shift, described by CalMatters, has been picked up by prosecutors who argue that diversion should be off the table or sharply limited when the alleged conduct is violent.
Local Capacity And The Stakes For Victims
Sonoma County has been quietly building up the machinery needed to run diversion in felony cases. County documents show the Department of Health Services has converted pilot diversion roles into permanent positions and laid out a clinic-based team model to handle outpatient felony diversion. The local setup includes clinicians, a psychiatric nurse and case management supports for people with serious mental illness, according to Sonoma County.
Defense advocates have argued, in comments reported by The Press Democrat, that the court-ordered evaluations in Calabrese's case clearly establish a qualifying mental illness and that diversion is working as intended. Prosecutors and some victims' advocates counter that the severity of the alleged assault and the level of force described in the arrest reports justify serious concerns about public safety.
What Comes Next
Calabrese had already been ordered to stand trial after a preliminary hearing in late June in front of a different judge. Navarro's ruling shifts the case onto a parallel track, with the court now focused on enforcing treatment conditions instead of immediately moving toward a jury trial.
The court will continue to monitor his compliance over the two-year term. Under the tightened standard in state law, prosecutors can ask to pull the plug on diversion and revive traditional prosecution if they convince the judge that Calabrese presents an unreasonable risk to public safety. If he completes the program as ordered, the current felony charges can be dismissed.
