This is the third suspension for a Panthers’ player in the past two days.
Alexander has two prior substance abuse violations, which explains the lengthy ban for him this time around.
Alexander, 25, is a former fifth-round pick of the Panthers back in 2012. He is in the final year of his four-year, $2.57 million rookie contract and stands to make a base salary of $660,000 for the 2015 season.
He unfortunately suffered a torn Achilles’ tendon during the preseason and was placed on season-ending injured reserve.
In 2014, Alexander was limited to appearing in just one game and recording a single tackle.