"Thank you SteelerNation for a big 9 years," Brown wrote on Twitter. "Time to move on and forward.......... #NewDemands." Brown posted a similar message on Instagram and both posts included a montage of career highlights accompanied by the song, "Do What I Want" by rapper Lil Uzi Vert.
The 30-year-old Brown has been rumored to be unhappy in Pittsburgh since he was benched for the regular-season finale against the Cincinnati Bengals following a practice dispute with quarterback Ben Roethlisberger. The Steelers won the game but missed the playoffs for the first time since 2013.
Earlier Tuesday, Brown was convicted in absentia on a charge of reckless driving in a suburban Pittsburgh court. Brown was charged in November for driving his black sports car over 100 mph in a 45 mph zone. He paid a $426.77 fine. Brown did not attend Tuesday's hearing.
Beyond the reckless driving charge, a lawsuit filed in October alleged that Brown hurled several large pieces of furniture off the 14th-floor balcony of his Florida apartment during an April outburst. The lawsuit claims that one piece of furniture nearly hit a 22-month-old child and his grandfather.
Despite the off-field strife, Brown caught 104 passes for 1,297 yards and a club-record 15 touchdowns in 2018. He has made at least 100 receptions in six consecutive seasons and owns the Steelers single-season record for catches and receiving yards (136 for 1,834 in 2015).
According to the Pittsburgh Post-Gazette, Brown cannot be traded until March 13, the start of the NFL's league year. ESPN reports that Brown is due a $2.5 million roster bonus on March 17. If he is traded after that date, his cap hit will increase from $21.12 million to $23.62 million. However, ESPN reports that cap hit can be spread over multiple years if Brown is traded after June 1.
The Associated Press contributed to this report.