the scientific jargon-filled dialogue, especially in the "squints" conversations, or laboratory scenes. He gives Brennan her nickname, "Bones", which she first hates, but comes to accept. He is a skilled investigator and interrogator who often relies on his "gut" and "cop instincts" (a quality unknown to Brennan). He is a decorated veteran of the United States Army Rangers, where he was a sniper. Booth has a son, Parker, from a previous relationship, and a younger brother, Jared, an officer in the U.S. Navy. He has two children with Brennan: a daughter, Christine, and a son, Hank. Raised in the Roman Catholic church, Booth is a devout believer in God and heaven. He frequently debates spiritual issues with Brennan, who regards all religions as primitive superstitions unsupported by empirical evidence. He plays hockey on a team with intern Wendell Bray, with whom he is close. He is purportedly a member of the well-known Booth family, and as such is related to Lincoln's assassin John Wilkes Booth. Michaela Conlin as Angela Montenegro: A forensic artist at the Jeffersonian Institute and Brennan's best friend, Montenegro is also her team specialist in forensic facial reconstruction—helping identify the victims. She can also generate holograms using her three-dimensional graphics program (the "Angelator" and later, the "Angelatron") to simulate various scenarios of a crime to help determine the cause of death. She and Brennan are best friends and rarely argue. She is open, friendly, and caring and repeatedly tries to draw Brennan out of the lab. She is often described as a free spirit. Angela's father is played by Billy Gibbons, guitarist of ZZ Top, who guest stars as a fictional version of himself. In season two, Angela begins a relationship with Jack Hodgins. They try to wed, but Angela discovers she is already married to a man she barely remembers; after her divorce from him is finalized, she and Hodgins break up. During this time, Angela dates intern Wendell Bray, but she marries Hodgins in season five and gives birth to their son, Michael Vincent, in season six. Her birth name is Pookie Noodlin, as revealed in the 10th season. Eric Millegan as Dr. Zack Addy (seasons 1–3; guest star, seasons 4–5, 11–12) is introduced in season one as Brennan's graduate student and intern. In season two, he receives his doctorates in forensic anthropology and applied engineering, and joins the staff of the Jeffersonian as a