The 35-year-old former Major League pitcher was found dead in his Palm Harbor, Fla., home Wednesday.
Investigators haven't determined the cause of his death.
“Soft-spoken guy, nice, father of two,” said Affeldt of Miller. “He never caused any problems. He was at the ballpark on time, did his stuff, did his work, competed. I think he was a great guy.”
The two played for the San Francisco Giants in 2009 together.
“He was always a good teammate,” Affeldt said. “I think everybody liked him and enjoyed him. Pitching-wise, he was competitive. For the year I got to hang out with him and play with him he was supporting and encouraging.”
Throughout his career, Miller played for the Blue Jays, Marlins and Giants before ending his career with the Los Angeles Dodgers.