Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) The man convicted of shooting at George Zimmerman in a road rage incident has been sentenced to 20 years in prison, Florida authorities said Monday. Matthew Apperson was convicted of attempted second-degree murder in September. In addition to the 20-year sentence, he was also given a 15-year concurrent sentence for aggravated assault stemming from the same incident, Seminole County State Attorney spokeswoman Lynne Bumpus-Hooper said. The road rage incident happened in Lake Mary, Florida, in May 2015. Zimmerman testified that Apperson followed him, flashing his lights and honking his horn. Apperson pulled up beside Zimmerman and shot at him, but the bullet missed, Zimmerman said. He was cut by glass from a shattered window."He joyfully bragged about killing me," Zimmerman says in courtMatthew Apperson was convicted of attempted 2nd-degree murder 
 Question:_ was acquitted of a second-degree murder charge in 2013.

George Zimmerman