Before the Steelers had a run of success with undrafted free agents in the 2000s, there was Jack Butler.
A defensive back from St. Bonaventure, and Pittsburgh native, he walked onto the Steelers' roster, and nearly immediately became a star on an otherwise downtrodden team. The Steelers didn't finish over .500 once in Butler's career, spanning from 1951-59. They reached the .500 milestone in 1957, when he had 10 interceptions and was named to his first of three All Pro teams.
Butler died Saturday at the age of 85.
Butler was inducted into the Pro Football Hall of Fame in 2012, alongside center Dermontti Dawson. He is second all-time in franchise history with 52 interceptions (trailing only Mel Blount's 57) and is tied for second with four interceptions returned for touchdowns.
He went to four Pro Bowls in his career, and is a member of the Steelers' All-Time Team. His 52 interceptions, at the time of his retirement, were the second-most in a career all time in the NFL, trailing Emlen Tunnell.
To put his numbers into context, Butler had 52 picks in 103 career games - or, one pick every 1.9 games. Blount had 57 interceptions in 200 games - one in every 3.5 games. If Butler's numbers held true to a 16-game season today, he would average eight interceptions a season.