Updated

St. Louis, MO (SportsNetwork.com) - The St. Louis Rams signed punter Johnny Hekker to a six-year extension through the 2020 season on Friday.

ESPN.com reported that Hekker's deal is worth $18 million and contains $9 million in guaranteed money, the largest ever given to a kicker or punter.

Hekker, 24, was set to become a restricted free agent after the 2014 season. The undrafted Oregon State product signed with the Rams prior to the 2012 campaign.

In 2013, Hekker earned All-Pro and Pro Bowl honors after setting an NFL single-season record for net punting average at 44.2 yards. His career net average is 42.1 yards.

This season, Hekker owns a 45.7 yards per punt gross average and a net average of 41.4 yards. In his three-year career, Hekker also has completed 5-of-6 passes with a touchdown.