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A user with the name 'Nikolas Cruz' - the name of the shooter who killed 17 people in a Florida high school on Wednesday - posted a comment under a documentary on a 1966 mass shooting, saying he wanted to do the same.

"I am going to what he did," (sic) the now-deleted comment read. It was posted under a Discovery UK documentary about the 1966 Texas University shooting, in which a former marine shot dead 18 and injured over 30 others from atop the main building tower at the University of Texas at Austin.

The chilling comment came nine months before Wednesday's Florida school shooting, with the suspect identified as 19-year-old Nikolas Cruz. Seventeen people were killed and over a dozen injured.

Other students at the school, cited by various US media outlets, said Cruz had kept a stockpile of guns, and suggested the attack was carefully planned. Cruz reportedly triggered school fire alarms intentionally to get students and teachers to exit classrooms, maximizing the casualties.

It is not immediately clear whether the Nikolaz Cruz YouTube account, with nine subscribers and no publicly visible video uploads, belonged to the shooter, but it was suspended for "violent content" hours after the Florida shooting, apparently following the discovery of the comment.

A YouTuber named Ben Bennight emailed the FBI tip-line in September after he noticed a comment left by a "Nikolas Cruz" on one of his videos. The comment read, "I'm going to be a professional school shooter."

Bennight lives in Mississippi and says he was "immediately" contacted by the local FBI office. He met with agents the following day. "That was the last I heard from them," he told BuzzFeed.

In the wake of the arrest of 19-year-old Nikolas Cruz for the murders of 17 people in Wednesday's school shooting in Parkland, FL, Bennight was again contacted by the FBI.

According to BuzzFeed, Special Agent Ryan Furr left the following voice mail: "I think we spoke with you in the past about a complaint that you made about someone making a comment on your YouTube channel. I just wanted to follow up with you on that and ask you a question with something that's come up, if you wouldn't mind giving me a ring."

Bennight says he was again visited by the FBI agents Wednesday and asked if he knew Cruz. When he told the agents he did not, they left.

As of this writing, there is no confirmation that the Nikolas Cruz who left that YouTube comment is the same Nikolas Cruz arrested for Wednesday's shooting massacre.

Seven months ago, Cruz wrote, "I am going to kill law enforcement one day they go after the good people," in the comments section of a video clip from the NatGeo show "Alaska State Troopers: Armed and Dangerous" that was posted on YouTube.

Then six months ago, he commented on a YouTube video titled, "Antifa Gun Club," writing, "Im going watch them sheep fall f*ck antifa i wish to kill as many as i can."

Cruz's Instagram account also contained questionable content, including a number of photos of him brandishing guns and knives, and showing off small animals and rodents he had killed.

Former classmates have said they were not surprised by the shooting or the fact that Cruz is the suspect. Joshua Charo told the Miami Herald that Cruz fit the description of a disgruntled student who would carry out a mass shooting.

"I can't say I was shocked," Charo said. "From past experiences, he seemed like the kind of kid who would do something like this."

John Crescitelli shared the same sentiment, saying his son had warned him about Cruz before. "If you were to pick one person you might predict in the future would shoot up a school or do this, it would be this kid," he said.

Family members of Nikolas Cruz also claimed that he has been taking medication for depression and emotional issues for several months. Given the social media posts and comments from the individual who has been described as a "troubled teen," it is becoming clear that the FBI should have seen the warning signs months ago.

The people who knew Cruz described him as a troubled teenager who was adopted when he was young and then was forced to move in with a friend after both of his adopted parents died. Jim Lewis, an attorney for the family that gave Cruz a place to live after his mother died in November, told The Washington Post that they knew Cruz was depressed, but they believed he taking steps to manage his depression.

Family member Barbara Kumbatovich told the Herald, "she believed Nikolas Cruz was on medication to deal with his emotional fragility." She was a sister-in-law of Lynda Cruz, the suspect's mother, and she also told the Sun-Sentinel that she believes Nikolas has been on medications for several months.

"I know she had been having some issues with them, especially the older one. He was being a problem. I know he did have some issues and he may have been taking medication. [He] did have some kind of emotional or difficulties," Kumbatovich said. "[Lynda] kept a really close handle on both boys. They were not major issues, as far as I know, just things teenagers do like not coming home on time, maybe being disrespectful."

Janine Kartiganer, a former neighbor, also described Crus as "very troubled," and said, "He wore a hoodie and always had his head down. He looked depressed."

An anonymous relative added another description, telling the Sentinel that they believed Cruz has been diagnosed with autism.

Jordan Jereb, leader of the Republic of Florida (ROF) group, told AP that Cruz "acted on his own behalf of what he just did and he's solely responsible for what he just did."

Jereb also said Cruz had "trouble with a girl" and he believed that it wasn't a coincidence the attack was carried out on Valentine's Day.

The Anti-Defamation League (ADL) said on Thursday that they called the ROF after self-described group members claimed Cruz was one of them on the discussion forum 4chan. Jereb confirmed that Cruz was associated with the group, having been "brought up" by another member, according to the ADL.

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Broward County Sheriff's deputies were called to Cruz's home at least 39 times since 2010, Fox 61 reported. The Associated Press later added that the sheriff's office said it received approximately 20 calls about Cruz over the past few years.

It is not clear whether some of the 20 calls they received overlapped with the 39 times sheriff's deputies visited Cruz's home or if they were separate incidents.