Booth and Brennan after Booth arrests her father. He is frequently consulted to provide a profile of the suspects and victims involved and to give a more "humanized" perspective on the case. Due to his age, he is initially treated by Booth and the Jeffersonian team in a condescending manner, but eventually earns their respect and their friendship; another FBI psychologist notes to Brennan and Booth that Sweets has imprinted onto them like a duckling, and he briefly lived with them. Throughout the series, he has an on-again/off-again relationship with intern Daisy Wick. He eventually is accepted by Brennan, who notably dismisses psychology as a "soft science", and is often sought out for advice by the team on both professional and personal matters. In the season 10 premiere, Daisy and he are revealed to be expecting a baby. Soon after, he is fatally assaulted while serving a warrant. He dies with Booth and Brennan by his side. John Boyd as James Aubrey (seasons 10–12) is a junior FBI agent working under Booth after Sweets's death. Originally, Aubrey tries to win Booth's approval and trust, as Booth is reluctant to work with him due to Aubrey's inexperience and his grief for Sweets. However, he is eventually accepted by Booth and the rest of the team. Aubrey gets along with everyone, and his love of food is often the subject of jokes. When he was a child, his father was an investment broker who cheated his clients and fled the country, abandoning Aubrey and his mother and leaving them with nothing. In season 11, Aubrey's father is found to be back in the country. In season 12, Aubrey is finally approached by his father, who asks him for money. He reveals he has another wife and young son back in the country where he had fled, to persuade Aubrey to give him financial aid. However, Aubrey realizes it is all a lie and eventually turns his father in. Near the end of season 12, Aubrey is offered a promotion to supervisory special agent in Los Angeles. Though Aubrey originally took the Los Angeles job, he instead decides to take a similar position in Washington, D.C., in the series finale. Recurring cast Loren Dean as Russ Brennan (seasons 1–3): Russ Brennan, or Kyle Keenan, is the older brother of Temperance Brennan - Joy Keenan, and the son of Max Keenan. Russ has a