Who is Rollie Simms from A Savage Place: A Spenser Novel and what is their importance?

Rollie Simms is the chief of security at Oceania Properties. Simms is the one who actually shot Candy and Franco, per Brewster's orders. When Spenser kidnaps Simms and Brewster the next day, Brewster tries to blame everything on Simms, so Simms tells the truth. Later when Simms and Brewster are arrested, Simms turns on Brewster and tells the complete truth, causing both men to be charged with numerous crimes. Not only that, but with these confessions, Spenser finally learns the truth about Candy's investigation and its conclusion.