Jackson was found "unresponsive in a sober living home" according to TMZ.
Jacskson was found dead on Friday at his home in the San Fernando Valley.
The US online publication reported: "We're told he was found unresponsive in a sober living home, and there were no signs of foul play."
His acting credits included a recurring role on US sitcom The Goldbergs as popular student Ari Caldwell.
He'd also appeared in several episodes of Nickelodeon comedy iCarly, starring opposite Jack Black and Miranda Cosgrove.
The 20-year-old had also featured in two episodes of hit US show Modern Family as Ted Durkas.
His cameo role saw him appear in 2010 and then for another episode in 2012.
Jackson also landed a big screen outing in 2011 children's movie Judy Moody and the Not Bummer Summer.
Speaking to Radio Nation about his acting career back in 2012, Jackson described his time on Modern Family as a "whirlwind."
He added: "I worked on Modern Family which was really fun and it was right when it started to become a big show, and I met the whole cast.
"Acting to me is on a business side a lot more easy to handle because it's all planned out. Music can veer off into any world and it's crazy. But acting is fun and I've got to work with some really great people and I'm grateful to be able to work with them."
Jackson recently provided the soundtrack for romantic movie Forever My Girl.
One of his final interviews took place on the red carpet for the movie launch in January.
Speaking to reporters on the carpet, Jackson opened up on the "amazing experience" of working on the movie.
The creative revealed: "Writing from a place of truth is a really big deal for me - whether it's about relationships, or whether it's about redemption or catharsis or whatever it is - it's not really about the subject, as it is about the progress and the experience, and the process that someone goes through without love. I draw inspiration from truth wherever that may lie."