Who is Lennie DeVille from L.A. Requiem and what is their importance?

Lennie DeVille is a known pedophile, who victimizes young boys and girls. He is also the man who Pike and Wozniak had cornered on the night of Wozniak's death. DeVille goes on to die in prison, but not before he befriends a young runaway boy named Laurence Sobek.