Miller is not taking part in the team's offseason program at team headquarters in the aftermath of his March arrest on suspicion of spousal battery.
Miller was arrested at an undisclosed location, police said. The 49ers said that the team is looking into details. The 27-year-old Miller spoke last fall of being newly engaged and buying a house after receiving a three-year contract extension in March 2014. The 49ers were committed to keeping a key member of their running game through the 2017 season.