Prosecutors are recommending that the ringleader in the stabbing of a gay teenage boy near the Howard Theatre last year be sentenced to about 11 years behind bars, court papers show.

Ali Jackson, 20, pleaded guilty earlier this year to bias-related assault with intent to kill in connection with the attack. He also pleaded guilty to assaulting a corrections officer whom he punched at the D.C. jail after he was arrested in connection with the stabbing.

Jackson is scheduled to be sentenced in D.C. Superior Court on June 28. Prosecutors are recommending that he be sentenced to 10 1/2 years of incarceration for the stabbing and 180 days for assaulting the officer.

On June 26, 2012, Jackson encountered the then-16-year-old victim, who was with a friend at the intersection of Georgia and Florida avenues NW. He called the teen a derogatory name and told a group of men in the area that he was about to stab the victim, court papers said.

The boy walked away, and Jackson ran into an alley near the Howard Theatre. He then came up from the alley, approached the victim, and yelled a gay slur and said he was going to kill the victim, according to court documents.

Jackson took out a knife, and the victim pepper-sprayed him. Jackson's sister's boyfriend, Desmond Campbell, then choked the victim, and Jackson stabbed him three times. The victim tried to swing his arms at Jackson while he was being stabbed, but Jackson's sister, Alvonica Jackson, grabbed the victim's arms and held him down, documents stated.

The assailants were arrested shortly after the attack. The victim was taken to a hospital and had his wounds closed.

According to a presentencing report cited by prosecutors, Ali Jackson claims that the victim wanted to start a fight with him and that the victim was friends with someone whom Jackson wronged after a relationship. He also said he was very drunk at the time of the stabbing.

But prosecutors wrote that this account contradicts their evidence and that Jackson admitted as part of his guilty plea that he attacked the boy because he was gay.

Prosecutors noted in a sentencing memorandum that Jackson has been arrested more than a dozen times and had previously threatened to kill the victim. Additionally, the victim, his mother and members of the LGBT community have feared for their safety because of the attack.

Jackson's sister and Campbell have pleaded guilty to their involvement in the attack on the teen and were each sentenced to 30 days behind bars, court records show.