Former England hooker Dylan Hartley has retired from professional rugby union after struggling to recover from a knee injury.
The 33-year-old is England's second-most capped player of all time and Northampton's longest-serving squad member.
Here, the PA news agency looks at his career in pictures.
![Hartley during an England training session at Twickenham](http://image.assets.pressassociation.io/v2/image/production/3635468f9b8816f75dd424707173db50Y29udGVudHNlYXJjaCwxNTczMjE4NzE1/2.35012502.jpg?w=640)
![Hartley lifts the Six Nations trophy in Dublin in 2017](http://image.assets.pressassociation.io/v2/image/production/ab733a55a3b6848f069df87e590354c1Y29udGVudHNlYXJjaCwxNTczMjE4NjU4/2.30593718.jpg?w=640)
![Prince Harry presents the Calcutta Cup to Hartley](http://image.assets.pressassociation.io/v2/image/production/b4efcfc85b53f2f8749cf20eb62cdbadY29udGVudHNlYXJjaCwxNTczMjE4NTMx/2.30498459.jpg?w=640)
![Hartley with the Six Nations Trophy after victory in 2016](http://image.assets.pressassociation.io/v2/image/production/9b24119171b5d71dae8136dfeac7e540Y29udGVudHNlYXJjaCwxNTczMjE4MzQ0/2.25871384.jpg?w=640)
![Hartley lifts the Old Mutual Wealth Cup at Twickenham](http://image.assets.pressassociation.io/v2/image/production/5bb126635ea28344e310be88bad37b69Y29udGVudHNlYXJjaCwxNTczMjE4MjQ1/2.26473498.jpg?w=640)
![Hartley during a 2011 Six Nations match at Twickenham](http://image.assets.pressassociation.io/v2/image/production/8dbf76197dadaff81bd3c7c6045b10b6Y29udGVudHNlYXJjaCwxNTczMjE3NDkx/2.10296392.jpg?w=640)
![Hartley trains with the England squad at Pennyhill Park, Surrey](http://image.assets.pressassociation.io/v2/image/production/08664d0392e5bd2b98a28cbdda194331Y29udGVudHNlYXJjaCwxNTczMjE3MzU1/2.10164940.jpg?w=640)
![Hartley and George North with the trophy after victory in the Premiership Grand Final at Twickenham](http://image.assets.pressassociation.io/v2/image/production/95f276420799fdfb52f66999a78a6bdbY29udGVudHNlYXJjaCwxNTczMjE3ODY0/2.19979116.jpg?w=640)
![Hartley (top centre) is congratulated by his teammates after scoring a try during an International match at Twickenham against New Zealand](http://image.assets.pressassociation.io/v2/image/production/608b8a84c3cb19a28fe3e4de6fe0efcdY29udGVudHNlYXJjaCwxNTczMjE3MTAx/2.9733761.jpg?w=640)
![Hartley prepares to pack down against the Gloucester scrum when playing for long-term club Northampton Saints](http://image.assets.pressassociation.io/v2/image/production/9d45170045bd89b15948a39518d9f5b7Y29udGVudHNlYXJjaCwxNTczMjE2OTU1/2.7094855.jpg?w=640)
![Hartley tackling Ireland's Tommy Bowe during a 2009 Six Nations match at Croke Park](http://image.assets.pressassociation.io/v2/image/production/032d7f4213c433f7876833e66b786a09Y29udGVudHNlYXJjaCwxNTczMjE2ODA4/2.6941762.jpg?w=640)
![Hartley representing England in the 2008 Investec Challenge Series](http://image.assets.pressassociation.io/v2/image/production/19c7ee2f9680e185e194240b7e6301b1Y29udGVudHNlYXJjaCwxNTczMjE2NDk4/2.6591514.jpg?w=640)