Kessler was arrested on the following charges: possession of weapon near school grounds, destroy/conceal evidence, brandish replica firearm, unlawful display of imitation firearm, change markings on imitation firearm.
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RELATED: Lockdown lifted at Tam High School in Mill Valley after police activity in area
A heavy police presence descended on the high school at around 1:50 p.m. on Monday after it was reported that a man wearing a ski mask was walking around with an AK-47 near school property.
Police lifted the lockdown after several hours of searching when police say they believe the man left the area in a car.
Witness reports led police to track down the license plate of Kessler's car. Police contacted him by phone and Kessler turned himself into a Marin Sheriff substation.
"We did have a deputy that located a vehicle at a Good Earth parking lot in Tam junction and ran the license plate of that vehicle which returned to a rental company," said Sgt. Brenton Schneider at a press conference Wednesday morning detailing Kessler's arrest.
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According to the Marin County sheriff, detectives were able to locate the AK-47, which was determined to be a replica AK-47 airsoft gun with electrical tape placed over the orange tip.
The AK-47 replica airsoft was discarded in bushes near a relatives residence in Mill Valley. Police say that Kessler admitted to using the airsoft gun and mask to shoot a Snapchat video near Tam High School.
The Marin County sheriff added that they have no reason to believe Kessler, who was a former student at Tam High School, intended on performing an act of violence on Tam High school.
Kessler is due in court on Thursday.