Teddy Gullo is a rival of tabloid photographer Gary Blanchard, as well as a brief suspect in the burglary of Blanchard’s apartment, leading to the murder of Detective Nick Carvahal. Blanchard stole a painting and sent Gullo to prison for the crime by falsely implicating him.
Gullo was cleared, but it was revealed Blanchard had Gullo stalk actress Sky Sweet’s movements for Blanchard to take snapshots of, in exchange for Blanchard playing Gullo a cut of the payout when the photos were sold to the tabloids. This led to the break in the investigation the detective needed. (L&O: "Fame")