The move comes on the same day Miami agreed to a four-year, $50 million contract with Kelly Olynyk, per Wojnarowski.
Johnson has played for the Chicago Bulls, Toronto Raptors, Sacramento Kings, Memphis Grizzlies and Heat during his NBA tenure. He posted career highs in points (12.8 per game), rebounds (4.9), assists (3.6) and three-point percentage (34.0) with Miami in 2016-17.
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It was a perfectly timed performance considering he was heading into free agency, but he has shown scoring flashes before with four other seasons above seven points a night.
Johnson is 30 years old but relatively fresh since he has played just 19.7 minutes per game throughout his career. He is 6'9" and a matchup problem because he can extend his game beyond the three-point line and shoot over smaller defenders or score against slower opponents inside the lane.
While he is not a franchise centerpiece, Johnson is a solid rotational player who last year demonstrated why he was a first-round pick out of Wake Forest.
If he continues down that path, the Heat will be pleased they brought him back.