Episode 308, "Unconditional Love"
SEASON 3, EPISODE 320 - "While on a date, Jules and paramedic Steve discover a hostage situation in progress at a neighborhood restaurant. SRU is called in, and work to take down the gunman as Jules and Steve remain inside the restaurant trying to diffuse the situation. They discover the shooter (Davis) is a paranoid schizophrenic and believes a terrorist owns the restaurant. Originally thinking he was acting on his own, the team eventually discovers that it is Davis social worker who has brainwashed him into killing the alleged terrorists. Steve is shot in the melee. Jules and the wounded Steve, who have known each other since college, break up at the hospital.[Steve also appears in episodes 303 and 304]."