Smith, a Pro Bowl defensive end, was released by the San Francisco 49ers Friday after a Thursday night arrest on hit-and-run, driving under the influence and vandalism charges. The arrest was the third on suspicion for Smith since he was the 49ers' first-round draft pick in 2011.
Miller was the Broncos' first-round selection in 2011 -- No. 2 overall -- and has previously outlined that he got to know Smith in all of the pre-draft events the two participated in.
"That's my guy," Miller said. "I am going to be with him until the very end. We're friends before anything else. That's my brother and he's going through a tough time right now ... He was there for me and I'm going to be there for him -- wherever that may be. He's just going through a tough patch right now. We all go through a tough patch ... People go through tough times. I'll be the first one to tell you. I've been through a lot of stuff and I'm going to be there for him however long it is to get him back right."
Miller was suspended for six games to open the 2013 season for violating the league's substance abuse policy. Also, during the same training camp when his suspension was levied by the league, Miller was arrested at suburban gun shop on an outstanding traffic warrant.
Miller, poised for big season in the Broncos' new 3-4 defense after qualifying for the Pro Bowl last season, was recently formally discharged from the league's substance-abuse program after two years of clean tests. Miller is also in a contract year and has the possibility of securing one of the league's largest contracts for a defensive player at season's end.
Earlier in training camp he said he came to the realization "that I needed to put everything together to make sure I could accomplish all I want to accomplish ... I don't think I was doing that before."
Miller also said he's "never been in a better place mentally, physically, personally, just everything, I know people want to keep seeing it, I want to keep seeing it, but I'm in a great place right now."
He offered Friday he believes Smith has an opportunity to rebound as well.
"I have full confidence that he will be able to get out of it," Miller said. "We'll see the same Aldon Smith that we saw his first two years in the league."