James Howell pleaded no contest to three charges on Wednesday - one count each of unlawful assault weapon activity, possession of a destructive device on a public road or highway and possession of a destructive device. He was then immediately sentenced to seven years and four months in state prison.
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The 22-year-old was arrested in his car before the 2016 parade. He told detectives he planned to attend the parade in West Hollywood, but he has never admitted he planned to harm anyone.
Inside Howell's Acura sedan with Indiana license plates, authorities found three assault rifles, high-capacity magazines and ammunition along with a five-gallon bucket with chemicals that could have been used to make an improvised explosive device, police said.
According to court documents, Howell also had a buck knife, a Taser, a black hood, handcuffs and a security badge in his car.
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This was one day after the Pulse Nightclub shooting in Orlando which claimed 49 lives. Security was increased at the LA Pride Parade as a result of the Orlando massacre and Howell's arrest.
One day after the charges were filed against him in Los Angeles, Howell was charged with sexually molesting a 12-year-old girl in Indiana, the Indianapolis Star reported in 2016.
According to the Star, Indiana officials believe Howell left for California after learning he was under investigation in the molestation case. Citing court documents and the victim's family, the newspaper also reported that Howell threatened to kill himself, members of the victim's family and police if they tried to arrest him.
The status of the Indiana case was not immediately known.
City News Service contributed to this report.