Meantimetonight, C for an independentnvestigatit this hour new images coming inonight aer T vio police tawn polieen beating an unarmed man after police he would not sit wn. Now, we what happened in the moments right before. Tot, the new body cam images, anajor questions about previous casnvolving the sameolicear Mesa, Arizona. And moment ago, we heard from the man who was beatenor first time. Herebc's whit joson. Dude, they told to sit down. Reporter: Tonight, growing calls for independent investigation of the Mesa, arizonolpartment. Have a seat.guess what?n't gonna K you again. Have a seat. Reporter: After newly released cam video showing what led up to this violent St. 33-yead Robert Johnson ignoring officer commands. All the way dowll the way down. Reporter: A knee to the body, a barrage of punches, dropping Jon to the for. Ou didn't edo put all that force on me. What did you need to put fists on me for? H? Hu yeahess what. You're a Boy. Eporter: Picsay Johnson was resisting, and thought he might have had a knife. But no weapon was found. It may say to be held accoblat they have done. Reporter: Hisorney say the case fits a pattern of ba behavior. Mesa has had a E hurting ople, shoot people, and killing people, anis is sad and its to stop immediately today. Rter: The pice departmentlready under fire afr this takdown of an 84-year-old grandmother in February. Rawl towardsme! Crawl towards me! Yes, sir. Rr: And the fatal shooting of an unarmed M in a hotel hallway. That officer fired and L acquitted of second degree murder. This is a trend. There's thing in the training, or you have to have type of accountability in thartment that's wea there's not a message being sent to officers on the ground that this kind of behavion't be tolerated. Reporter: Tesa police chief of police says he's already making changes, bu calls the viof Robert Johnson's arrest "Troubling." This in ny represents te work THA done every day. Ey're human beinnd certainly, at first glance, this lolike a mistake. So, LE get to whit Johnson with us again tonight. And whit, I know after several cases involving this police department, there are calls tonight for an independent investigation. Is there any sign that that's going to happen? Reporter: Well, Davi we Mesa police a already cooperating with the jus department on a civil rights investigation into that shooting H an med man. Still, though, activists are saying that that doesn't go F enough. Into the