Michael Brown was 6'4'' and 292 lbs. The primary witness to the police shooting, Dorian Johnson, is Brown's alleged accomplice in the robbery.

From the police report:

The video reveals Brown enter the store followed by Johnson. Brown approaches the register with Johnson standing behind him. [redacted] can be seen in the background walking from the restroom to behind the counter. Brown hands a box of Swisher Sweets to Johnson. An apparent struggle or confrontation seems to take place with Brown, however it is obscured by a display case on the counter. Meanwhile, Johnson sets the box he was handed back on the counter. Brown turns away from the counter with another box of Swisher Sweet cigars and walks towards the exit door.
[redacted] then comes out from behind the counter, with what appears to be a set of keys in his hands.

[redacted] then stands between Brown and the exit door. Brown, still holding a box [sic] Swisher Sweets in his right hand, grabs [redacted] by his shirt with this left hand. Brown aggressively pulls [redacted] in close to him and then immediately pushes him back in to a display rack. Johnson continues out the door and out of camera frame. [redacted], no longer between Brown and the door, stops and watches Brown as he walks towards the exit door. Brown then abruptly turns back around and advances on [redacted] Brown towers over [redacted] appearing to intimidate him. Brown then turns back around and walks out of camera view.