He was convicted in 2005 and 2011 of molesting juveniles, is awaiting trial on sex charges in Texas, and is wanted on charges of first-degree rape and molestation of a juvenile in Calcasieu Parish, authorities said.
A Calcasieu Parish judge set his bond at $4 million, news agencies reported.
Broussard, a registered sex offender, is accused of killing Kyla Hidalgo, 17, and Kaleb Charlton, 18; wounding the girl's mother, Catherine Hidalgo, 40; and kidnapping the woman's 14-year-old daughter early Wednesday morning in the Calcasieu Parish town of Westlake.
The 14-year-old was found shortly before 7 a.m. Wednesday in Ragley and her mother's stolen car was found the same day in woods in the Ragley area, KPLC-TV reported.
Scores of officers from three sheriff's offices, state police and the FBI swept the area, hunting for Broussard, Calcasieu Parish Sheriff Tony Mancuso said during a news conference Thursday with Beauregard Parish Sheriff Mark Herford.
Mancuso commended Salter's and Cook's bravery, adding, "we were so close we got there within seconds and were able to apprehend him without any incidents."
Mancuso said a second person was arrested but did not give details.