Apple’s iOS engineering vice president, Henri Lamiraux, recently retired from Apple after 23 years with the company. His recent retirement was mentioned on his LinkedIn profile and was confirmed by Lamiraux himself to the folks over at 9to5Mac. The following was mentioned regarding the matter:

He says that he retired from Apple a "couple of weeks" ago, following the release of iOS 7.0.3. Lamiraux decided a "little while ago" that iOS 7 would be his last release.

Sources within Apple's iOS division say Lamiraux is respected and he was in charge of developing the applications that come with iOS. The executive also led feature-implementation across the operating system, and he managed both bug-fixing processes and feature distribution to consumers. He also managed the frameworks within the operating system that power features and allow developers to build applications.
For those of you who didn’t know, Lamiraux joined Apple in 1990 and spent ten years as a Mac OS and later OS X software engineer before being promoted into more senior positions. He made the move over to iOS in late 2005, which was well before the original iPhone was shown to the public and served in several managerial roles. Ultimately he became the Vice President of Software Engineering iOS Apps and Frameworks in September of 2009.

No word of a replacement has been mentioned although one is likely to be lined up or appointed in the near future.

Source: LinkedIn via 9to5Mac