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Former NFL player and Harvard-Westlake graduate Jonathan Martin has been charged with making criminal threats stemming from an Instagram post with guns that prompted the closure of the school’s two campuses in February, officials announced Tuesday.

Jonathan Martin, center, walks with his attorney Winston McKesson, left, to be booked at the Los Angeles Police Department after pleading not guilty to making criminal threats at the Van Nuys Courthouse on March 20, 2018. (Credit: Gary Coronado / Los Angeles Times)
Jonathan Martin, center, walks with his attorney Winston McKesson, left, to be booked at the Los Angeles Police Department after pleading not guilty to making criminal threats at the Van Nuys Courthouse on March 20, 2018. (Credit: Gary Coronado / Los Angeles Times)

Martin, 28, posted a photo of a shotgun to his verified but private Instagram account, writing “When you’re a bully victim & a coward, your options are suicide or revenge.”

The post included the hashtags #HarvardWestlake and #MiamiDolphins, his former professional football team.

Harvard-Westlake’s Studio City and Beverly Crest campuses were closed because of the post.

Martin left the Dolphins in 2013 after accusing former teammates, including Richie Incognito, of bullying him, according to CNN.

He had previously posted on social media about suicide attempts while playing in the NFL.

Martin surrendered Tuesday in a Van Nuys courtroom.

He pleaded not guilty to four felony counts of making criminal threats and one misdemeanor count of carrying a loaded firearm in a vehicle. He posted $210,000 bail, his attorney, Winston McKesson, told CNN.

McKesson added that he doesn’t believe Martin is guilty of any crime.

“This was a cry for help,” McKesson said, and adding that Martin is getting treatment for his emotional state.

Martin is scheduled to return to court on April 25 for a preliminary hearing. He faces up to six years in custody if convicted as charged.

Jonathan Martin talks to the media after the rookie minicamp on May 4, 2012 at the Miami Dolphins training facility in Davie, Florida. (Credit: Joel Auerbach/Getty Images)
Jonathan Martin talks to the media after the rookie minicamp on May 4, 2012 at the Miami Dolphins training facility in Davie, Florida. (Credit: Joel Auerbach/Getty Images)