Nah, I’m done. Thanks for asking. (Christian Petersen/Getty Images)

Even though former Detroit Lions wide receiver Calvin Johnson announced his retirement in March, there were those who thought he would at some point change his mind. He’s only 30 and had played only nine NFL seasons, with just two playoff games under his belt. Surely he’d want one more shot.

Calvin Johnson does not want one more shot.

“There’s just a time when you’re content with what you did. I’m content with what I did,” Megatron told the Detroit Free Press on Saturday in a video posted to the paper’s website. “I’m not coming back. You don’t have to worry about that.”

Johnson told the Freep’s Dave Birkett that he still gets asked about it all the time, yet his answer remains the same.

“I know everybody wants to know why I retired, but it’s more so, I put a lot into the game and it’s taken a lot out of me and that’s where I’m at right now,” Johnson said. “I’m not going to get into the specifics of the things that I feel it’s taken away, but it definitely feels good, I guess I can say for myself, to spend more time around the family, my son. I just got married, so things are going good right now.”

In retirement, Johnson says he’ll head back to Georgia Tech, where he’s 30 credits shy of his business-management degree. And hopefully the injured right ring finger that bedeviled him near the end of his career will eventually get better. Birkett reported that Johnson was still wearing a splint on the finger Saturday when he caught up with him at Johnson’s football camp at a Michigan high school.

“My finger’s jacked,” Johnson said. “I mean, I’m beat up. After you play that long you’re going to be beat up, so it’s just a time where you are content with what you did, and I’m content with what I did so far.”

Johnson finished his career with 731 catches for 11,619 yards and 83 touchdowns. In 2012, he put together 122 catches for a league-record 1,964 receiving yards. His 122.8 receiving yards per game that season is the highest average in the Super Bowl era.