I would like to report a player that not only I but many people are suspicious that he is cheater.

Here are some battlereports of it and a video too.

http://battlelog.battlefield.com/bf4/pt/battlereport/show/1/970038644540760960/655024687/

http://battlelog.battlefield.com/bf4/pt/battlereport/show/1/970476152495858560/655024687/

https://www.youtube.com/watch?v=aKGxv2_T15I

Many people complain that it is aimbot, but I think at least wallhack it uses.

The video looks to me like a player who it very familiar with the map and frequently used paths and areas of cover. None of his shots looked like he absolutely knew where a player was. 

Yes, but the suspicion is that it kills from far away from 870ms with coyote sight.

They are using slugs in the 870 on hardcore. At most ranges that is a one shot kill. We see no further evidence. This thread will be closed.