Michael Sam’s 10-year NFL career ends after knee injury

Michael Sam, the Dallas Cowboys quarterback who was drafted in the second round of the 2012 NFL Draft, has been diagnosed with a torn meniscus in his left knee.

Sources told ESPN.com that the knee injury is serious and will require surgery.

Sam has been recovering at the team’s facility, where he is receiving treatment.ESPN.com’s Adam Schefter reported Saturday that Sam’s knee has become infected with a potentially deadly bacteria that can infect bone marrow.

Sam, the No. 1 overall pick in the 2012 draft, was the most prolific pass-catcher in the NFL during his 10-season career with the Cowboys, winning six Pro Bowls and winning three Super Bowl rings.

Sam played his college football at Utah and was named the Pac-12 Conference’s Offensive Player of the Year.

His play on the field earned him two All-American honors, including the 2009 season in which he led the league in passing touchdowns (25).

Sam is the second quarterback taken in the first round of that year’s draft to suffer a knee injury.

The Cowboys selected Notre Dame’s Johnny Manziel with the No