Where are you getting your information from? No facts about that have come out.
Can read a lawbook.
From another thread, had presence of mind to save the post.
Missouri Revised Statutes
Chapter 563
Defense of Justification
August 28, 2013
CHAPTER 563
Law enforcement officer's use of force in making an arrest.
563.046. 1. A law enforcement officer need not retreat or desist from efforts to effect the arrest, or from efforts to prevent the escape from custody, of a person he reasonably believes to have committed an offense because of resistance or threatened resistance of the arrestee. In addition to the use of physical force authorized under other sections of this chapter, he is, subject to the provisions of subsections 2 and 3, justified in the use of such physical force as he reasonably believes is immediately necessary to effect the arrest or to prevent the escape from custody.
2. The use of any physical force in making an arrest is not justified under this section unless the arrest is lawful or the law enforcement officer reasonably believes the arrest is lawful.
3. A law enforcement officer in effecting an arrest or in preventing an escape from custody is justified in using deadly force only
(1) When such is authorized under other sections of this chapter; or
(2) When he reasonably believes that such use of deadly force is immediately necessary to effect the arrest and also reasonably believes that the person to be arrested
(a) Has committed or attempted to commit a felony; or
(b) Is attempting to escape by use of a deadly weapon; or
(c) May otherwise endanger life or inflict serious physical injury unless arrested without delay.
4. The defendant shall have the burden of injecting the issue of justification under this section.
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Once Mr. Brown assaulted the police officer, the felony was commited, assault on a police officer. From that moment onwards, lethal force was authorized.
Doesn't matter he wasn't armed, or was in retreat.
The felony aspect Mr. Brown would be guilty of is probably this (rushing at the officer, and/or slamming the door on him as he tried getting out, or physically wrestling with the officer or going for his weapon.)
Section 565-082 Assault of a law enforcement officer
(6) Purposely or recklessly places a law enforcement officer, corrections officer, emergency personnel, highway worker in a construction zone or work zone, utility worker, cable worker, or probation and parole officer in apprehension of immediate serious physical injury; or
7. Assault of a law enforcement officer, corrections officer, emergency personnel, highway worker in a construction zone or work zone, utility worker, cable worker, or probation and parole officer in the second degree is a class B felony unless committed pursuant to subdivision (2), (5), (6), or (7) of subsection 1 of this section in which case it is a class C felony. For any violation of subdivision (1), (3), or (4) of subsection 1 of this section, the defendant must serve mandatory jail time as part of his or her sentence.