<Li> Dominic Fumusa as Detective Keith Roman: An LAPD detective involved in the conspiracy . Roman blames Billy for getting a killer off who then went on to murder a family a few years ago . </Li> <Li> Paul Williams as J.T., a former colleague of Billy's with extensive contacts, who left his legal practice following the execution of a client . </Li> <Li> James Wolk as FBI Special Agent Jeff Clayton, who agrees to help Billy hunt down his prime suspect in the Marcos Pena murder . </Li> <Li> Alexandra Billings as Judge Martha Wallace, the judge in the Pena murder case, and a former prosecutor who has history with both Billy and J.T. </Li>

Who plays the fbi agent on goliath season 2