The Golden Knights acquired a second-round pick in the 2021 NHL draft and a 2022 fifth-round selection.
It's the second trade in two days for Vegas, which continues to shed payroll in a bid to get under the $81.5 million salary cap. Miller completed the first year of a four-year, $15.5 million contract he signed last summer. On Thursday, the Golden Knights traded forward Erik Haula to Carolina.
The 26-year-old Miller has four seasons of NHL experience and had three goals and 26 assists for 29 points in 65 games last season. That was a drop-off from the previous year when he led Golden Knights defensemen with a career-best 41 points (10 goals, 31 assists).
The Associated Press contributed to this report.