WWE has issued the following statement
AJ Lee (April Mendez) has decided to retire from in-ring competition with WWE. We wish AJ the very best.
No reason has been given, nor was it made clear whether Lee will still make non-wrestling appearances for the company.
AJ Lee signed a WWE developmental contract in 2009. She appeared in FCW (then a WWE Developmental promotion) for approximately one year before making her NXT debut in 2010. In 2011 she was promoted to the main roster, appearing on both Raw and Smackdown where she quickly became one of the most popular female talents. She is a three time WWE Divas Champion, and holds the records for both the longest single and combined reigns.