AUSTIN, Texas — A suspect in a series of Interstate 35 rock-throwing incidents in Central Texas has been sentenced to 99 years in prison after his conviction of sexual abuse in an unrelated case.

The Austin American-Statesman ( reports a Travis County jury sentenced Patrick Eugene Johnson on Thursday after finding him guilty of aggravated sexual assault of a child and indecency with a child. Johnson, who is 60, won’t be eligible for parole for 30 years.

Authorities say Johnson, who was arrested in June, was charged with molesting a boy numerous times since 2012.

Johnson still faces multiple aggravated assault counts in a series of I-35 rock-throwing incidents in the Austin area.

Three motorists were injured, including a person who suffered brain damage after the rock crashed through his windshield in 2014.

Information from: Austin American-Statesman,