"I think it's safe to say that when you look at this individual, you're looking at a coward. He's a coward," Armstrong said, holding up a photo of Wilbourn. "You gun down, you murder a police officer for less than two grams of marijuana. You've literally destroyed a family. Look at the impact that that's had on this department, this community, this city, for less than two grams of marijuana."
However:
Wilbourn had been free on supervised release for a 122-month bank robbery sentence, Armstrong said. Wilbourn now faces a first-degree murder charge.
IMO, he didn't shoot Bolton over a misdemeanor. He shot him because he was facing guaranteed time from the last charge, as well as a multitude of charges from being a felon in possession of a firearm, carrying a firearm during the sale of a controlled substance, and other charges. He was probably looking at decades in prison. It's still not a good reason to shoot a police officer, but I think he knew he wasn't just getting a misdemeanor charge.
Source for the news article
Source for "Offense of possessing a firearm during commission or attempt to commit dangerous felony."
Source for "Unlawful carrying or possession of a weapon."