Nicholas Zarantonello, 24, had two passengers on the pontoon boat he was operating on the lake when Jason Gil, also 24, went overboard while the boat was moving, Morris County Prosecutor's Office said in a joint release with state and local police Thursday.
Gil of Mount Arlington did not resurface.
Gil's body was later found in the water two days after the incident, during which Zarantonello was under the influence of drugs or alcohol and was operating the boat recklessly, the prosecutor said.
Zarantonello was charged with one count of death by vessel, a second-degree crime.
More than $30,000 had been raised for Gil's family on a GoFundMe as of Thursday morning.
"Jason was a valued employee at TriCounty Ortho whose care and compassion touched many patients lives," David Epstein said on the campaign. "He will be deeply missed by his friends and colleagues."
"Jason calmed my nerves when I was going in for a procedure," Kathy Drury said.
"I was his co-worker but that day I was a patient and he really was there for me and I was really grateful."
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