And Hawthorn premiership ruckman Robert Campbell, who spent one season as a rookie with Melbourne, has retired.
General manager of list management Tim Harrington said: “We wish the departing players every success for the future and sincerely thank them for their contribution to the club.”
Maric played 21 matches and kicked 15 goals from 2008-11 after he was selected at No.21 in the 2007 NAB AFL Draft.
He made nine appearances in 2011, which included a career-best 31-disposal performance against Adelaide Crows in round seven.
McNamara was originally selected at No.66 in the 2007 NAB AFL Draft.
The defender-turned-midfielder was delisted at the end of the 2010 season, but redrafted at No.83 in the 2011 NAB AFL Rookie Draft (held in December 2010).
He played four matches for Melbourne - three in 2009 and one in 2011.
Midfielder Johnston spent one season with the Demons, after he was selected at No.63 in the 2011 Rookie Draft.
Campbell was a member of Hawthorn’s 2008 premiership, but retired after 2009 due to a knee injury.
But he returned to play for Box Hill Hawks in the VFL in 2010 and was drafted by Melbourne as a mature-age rookie for the 2011 season. He was claimed at No.75.
Although Campbell didn’t play a match at Melbourne, he was a respected figure and provided leadership at the club.
He played 116 matches for the Hawks after debuting in 2002.
As already announced last Saturday night, Melbourne landed former Brisbane Lion forward/ruckman Mitch Clark in exchange for No.12.
On Monday, the Demons traded defender Matthew Warnock for selection No.52.
In September, midfielder Tom Scully joined Greater Western Sydney as an uncontracted player.
Key list management dates