Last month former NFL offensive lineman Jonathan Martin was arrested after posting the following threat to his Instagram, just nine days after 17 people were killed in a shooting at Marjory Douglas High School in Florida:

More information regarding the details of what happened that day were revealed on Thursday, courtesy of TMZ Sports. As the site notes, Martin was arrested with a cache of weapons in his possession, including an ax, knife, and loaded shotgun. Additionally, TMZ notes that Martin had been threatening former classmates for years.

Officials had been made aware of Martin's location after they received a call regarding a "suicidal male with a gun" at a Glendale, California hospital. Subsequently, he was placed on a 72-hour psychiatric hold because officials considered him a danger to himself and others. That was when they performed a search of his vehicle and found the trio of weapons listed above.

TMZ adds that officials talked to Martin's girlfriend who informed them that the ex-lineman had been angry and depressed since the day they met, but that he'd recently been making suicidal statements. His girlfriend also told them that he had been "writing on the walls" at his house.

From there the authorities learned that the two ex-classmates mentioned in the post pictured above had been receiving bizarre/disturbing Facebook messages from him since 2016.

"Thank you for being such an asshole to me when I was a kid and didn't fit in ... being dicks to me when I was a kid has made me, quite literally, insane," one of those messages said. "And I blame you above all. You'll get yours, eventually -- I have already paid my price for being a bad person. I wish you nothing but the worst. Best, Jonathan Martin."

A second message sent to that same person read "You're a bad person. You irreparably damaged people's lives. And you will be exposed publicly. If there is anything else I accomplish in life, it will be making sure you are outed and shamed for who you are."

A third message (which was not publicized) is said to have contained "similar language." That classmate added that Martin apologized to him later on in 2016, though clearly all is not forgiven. Finally, cops revealed that Martin purchased a shotgun less than two weeks prior to the first Facebook post, while also buying a second one shortly afterward.