Kris Dielman showed up in San Diego in 2003 as an undrafted free agent out of Indiana and somehow stuck around. The Chargers signed him, cut him at the end of camp, then brought him back to the practice squad. With six games left, they called him up as a reserve, and he spent the next year mostly on the bench before the team finally handed him the starting left-guard job in 2005.

Once he got the job, he played like he had something to prove. Teammates called him the enforcer and the battering ram—the guy who loved to finish blocks and kept the scuff marks on his helmet so everyone could see how hard he hit. In 2007, he went an entire season without allowing a sack and earned the first of four straight Pro Bowls. The next two years he was even better: Second-Team All-Pro in both 2008 and 2009, with an Approximate Value of at least 15 each time, while the Chargers kept stacking division titles and LaDainian Tomlinson ran behind a line that felt like it could move anybody.

Everything changed in 2011. Dielman took a nasty shot against the Jets in Week 6, staggered around, stayed in the game anyway, then suffered a seizure on the flight home. The Chargers put him on injured reserve, and the concussion issues lingered. He retired the following spring, deciding the risk wasn’t worth it.

By the time he walked away, he had started 97 games in a Chargers uniform, earned four Pro Bowls, and left a reputation as one of the nastiest, most reliable guards the franchise had seen in years—the kind of player who made the whole line feel tougher just by lining up next to him.