Lions' Calvin Johnson Announces Retirement

Calvin Johnson is hanging them up, the Detroit Lions announced Tuesday.

The most prolific wide receiver in franchise history and one of the most talented at the position in NFL history is retiring after nine professional seasons in which he accumulated over 11,000 receiving yards, seven 1,000-yard seasons and six Pro Bowl invitations.

Johnson holds nearly every significant franchise record; the man nicknamed "Megatron" holds 15 NFL records, including the most receiving yards in a season with 1,964 in 2012.

In a statement released by the Lions, Johnson said he would not be having a news conference to discuss his decision.

"Let me begin by apologizing for making this announcement via a statement and not in person. While I truly respect the significance of this, those who know me best will understand and not be surprised that I choose not to have a press conference for this announcement.

"After much prayer, thought and discussion with loved ones, I have made the difficult decision to retire from the Lions and pro football. I have played my last game of football.

"Let me assure you that this was not an easy or hasty decision. As I stated, I, along with those closest to me, have put a lot of time, deliberation and prayer into this decision and I truly am at peace with it.

"I also want you to know that I have the utmost respect and admiration for the game of football. It has provided so much for me and my family and I will be forever grateful to the game.

Williams Signs With Dolphins

Defensive end Mario Williams has agreed to a two-year contract with the Miami Dolphins worth $17 million, including incentives that can push the deal to $20 million, Williams confirmed to ESPN's Josina Anderson.

"It feels rejuvenating," Williams told Anderson of his new deal with the Dolphins.

The Dolphins announced Williams' signing on Tuesday night.