The answer was nearly always the same: "'You just know.'" Palmer said in a letter published by the Cardinals.
The Arizona Cardinals are expected to interview defensive coordinator James Bettcher for the open head coaching position Wednesday morning, according to 98.7 FM Arizona's Sports Station's Mike Jurecki.
The No. 1 overall pick in 2003 out of USC, Palmer spent the first seven seasons of his career with the Cincinnati Bengals, where he went to the playoffs twice and the Pro Bowl twice.
Palmer's final career numbers included 46,247 passing yards, which ranks 12th all-time; he threw for 294 touchdown passes, which ranks 12th all-time.
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"For me, that time is now". He also finished with a 62.5 completion percentage and an 87.9 passer rating. Those are details that I know fade with time. In 2015, he started all 16 games and Arizona was 13-3, advancing to the NFC Championship game, where it lost to the Panthers.
The 39-year-old Bettcher served under Arians as outside linebackers coach for the Indianapolis Colts in 2012, and he took on the same role in Arizona in 2013 when Arians became the head coach in Arizona.
With Palmer and Arians moving on, the team is still awaiting word from future Hall of Fame wide receiver Larry Fitzgerald on his plans for 2018.
The retirement of Palmer, though not unexpected, leaves the Cardinals without a quarterback on their roster.