Sam Koch, the longest-tenured player in Ravens history and a punter coach John Harbaugh hailed as “revolutionary,” announced his retirement from the NFL on Thursday. Koch, 39, will join the Ravens’ coaching staff as a special teams consultant and work with rookie punter Jordan Stout, a fourth-round pick in last month’s NFL draft. Koch appeared in a franchise-record 256 regular-season games over his 16 seasons in Baltimore, including a record 239 in a row from 2006 to 2020.