Syracuse code enforcement officials on Thursday issued eight violations to the Syracuse Academy of Science Charter School, where a custodian was found dead this week amid elevated carbon monoxide levels, according to the city's data portal.

The violations involve "structure unfit for human occupancy," "removal of or tampering of equipment" and "carbon monoxide alarms and detectors," according to the city website. Other violations were for an unsafe structure, maintenance of required safeguards, building permits, mechanical equipment and appliances and property maintenance, according to the city.

A member of the charter school's night cleaning crew who had worked there three years — identified at a vigil Thursday by his sister as Brian Deforge — died Monday night, the school said.

Authorities have not released results of an autopsy or other information about cause of death, and said Thursday they have not provided or verified information put out by the school. Additionally, five adults were taken from the school to the hospital for an exam and monitoring before being released, according to the school.

The investigation remains active and ongoing, police said.

The vigil for Deforge was held outside the Syracuse Academy of Science Charter School. Deforge's sister, Angel Christian, said he had just turned 46 on Christmas Day, and had worked at the school for three years.

His family remembered him as a religious man who loved helping out kids and animals.

"He was an amazing guy," Christain said. "He loved his job, he loved children and even though me and him had our ups and downs, he was an amazing brother."

First responders were called to the school Monday to check on a report of a man suffering cardiac arrest.

While there, Syracuse fire officials found high levels of carbon monoxide in the Syracuse Academy of Science's kitchen.

Members of the Syracuse Fire Department and city code enforcement inspected the building. According to the fire department, it and National Grid identified an improperly vented appliance in the kitchen area as the source of the elevated levels of carbon monoxide.

The school said Wednesday that a device in the cafeteria, "previously thought to be a smoke and carbon monoxide detector, was actually just a smoke detector."

The high carbon monoxide levels forced an evacuation of the school. Students and staff were moved to the nearby district office building.