The actor, most famous for his role in US comedy The Goldbergs, passed away on Friday, aged 20.
TMZ reported how Jackson was found "unresponsive in a sober living home."
The website claimed that although he had a "history of heroin use, Jackson was clean when he last underwent a drug test".
Now, a family friend has slammed suggestions that Jackson was depressed and has exclusively told The Sun Online that he believes he never would have killed himself.
American comedian Josh Wolf, whose son Jacob was best friends with Jackson, said: “It is important people know this was not a sad kid.
“This is a young man who lost his life and the truth of the matter is that he was so ready to live, so it was a complete shock to all of us to find out he had passed.
“There was no part of Jackson that was suicidal and Jackson should not be lumped in with anyone that is suicidal, or that was looking for a way out.
“Whatever his past was, I can tell you I have known Jackson for six years, through whatever, and there was never a moment in time when this kid did not love life.
“He was ready to live, to share his gift, to spread love, be loved and enjoy life.
“Jackson loved being round his friends and family and playing his music and laughing and smiling.
“No matter what was happening in his life, those things never changed.
He added: “It is a shame that as a young man who celebrated life so intensely, that whatever he may or may not done at some point in time, is what people are now focusing on.”
Referring to the recent suicides of celebrity chef Anthony Bourdain and fashion designer Kate Spade, Josh added: “I read an article that mentioned Anthony Bourdain, Kate Spade then Jackson.
"I was like, 'this is not right, he is not them.'
“Jackson was really truly all about love.
"He wanted to give love, receive deep love and his arms were constantly wide open.
“It makes it that much more difficult to comprehend what has happened. He just had so much to share.”
Ed Winter, assistant chief of operations for the Los Angeles coroner’s office, told US website RadarOnline that Jackson's body was discovered by the manager of the sober living facility where it is believed he had been living for around three weeks.
Josh explained: “He went to check on Mr Odell and found him in his room unresponsive.
“He called paramedics and they pronounced him dead at the scene.”
The Los Angeles County Coroner’s office have confirmed an autopsy took place last weekend, but said the results had been deferred pending further examinations, including a toxicology report.
But Josh says that just three days before his death, Jackson could not have been happier when he performed on Josh’s online comedy show Controlled Chaos.
He recalls: “I saw him on the Tuesday before he died and he was so happy.
“He performed his newest song and talking to him afterwards, this was not a boy who was down or in a dark place.
“The day before he’d also been at our house hanging out with our son Jacob and a bunch of their friends and he was laughing, having fun and just seemed really happy to be alive.
“There was just no way he was a depressed young man.”
Josh's teenage son Jacob met Jackson six years ago, when the actor was 14-years-old.
Josh, who lives with his film director wife Bethany Wolf in Los Angeles, said: “Our son came home one day from a friends house about six years ago, when he was about 15 and he seemed so different when he came home.
“Usually when a kid comes home, they are not super excited to tell you what they’ve done, but this time could not wait to tell us about this kid he’d met called Jackson.
“It was painfully clear he was unlike any other kid you were going to meet. He shined so bright.
“What struck me so much the first time I met him, was his maturity, his broad understanding at such a young age of how big the world was and how much it had to offer."
“You could talk to him about anything.
"He was not a kid who was going to sit in the room and play Xbox and if the kids were playing Xbox, he would be in the room playing guitar.
“I cannot explain how captivating he was when he played his music.
“I’m a performer and there are not that many performers where I think 'I just have to watch’ but Jackson was one of them.
Fighting back tears, it is clear Jackson meant the world to the Wolf family.
Josh says: “For the past six years Jackson has been a staple in our family home and he will be sorely missed.
“I found out about his death when Jacob texted me and we have all been in shock ever since.”
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