Police Chief Jackson has stated that Officer Wilson did not know that Brown was a robbery suspect. From the St. Louis Post-Dispatch:
The officer who shot Ferguson teen Michael Brown stopped Brown and another teen because they were walking in the street, not because of a robbery a few minutes earlier, Ferguson Police Chief Tom Jackson said Friday afternoon.
Jackson said Michael Brown and Dorian Johnson were suspects in the robbery, but the officer wasn't aware of that. The officer, Darren Wilson, knew there had been a robbery but did not know that Brown and Johnson might be suspects.
"The initial contact between the officer and Mr. Brown was not related to the robbery," Jackson said in a news conference shortly after 2 p.m. "(The robbery) had nothing to do with the stop… They (Brown and Johnson) were walking down the street blocking traffic, that was it." Ferguson officer stopped Michael Brown for walking in street, but then saw Brown had cigars that might have been stolen, chief says : News