Jada Justice's body was discovered Thursday only a short distance from a six-year-old crime scene that sources close to the investigation say may help link the girl's disappearance to the boyfriend of her baby sitter.

A source with direct knowledge of the investigation said authorities believe Tim Tkachik was involved in the transport and disposal of the 2-year-old's dead body in rural LaPorte County, near Otis, Ind.

MORE: Click here for more reports on the Jada Justice case.

"I have no belief whatsoever that my little brother could've done anything close to that," Tkachik's brother, Nicholas Tkachik, said Thursday. "That's just not him."

The brothers experienced their own family tragedy in Otis more than six years ago, an act that occurred near the rural site where sources close to the investigation say Jada's body was discovered.

The brothers' father, Barry Tkachik, is believed to have murdered their mother and aunt before turning the gun on himself in February 2003 at the family's home. Their parents were reportedly going through a divorce at the time, new reports from the time state.

Neither of the brothers was home when the double homicide-suicide took place.

Nicholas Tkachik said his brother took their family tragedy the hardest because he was close to their mother, Michelle Tkachik.

Tim Tkachik was arrested three times in seven months on drug-related charges after his parents' and aunt's deaths, police and court records show.

He was charged in summer 2003 for possession of marijuana, police records state. And he was charged in September 2003 with multiple criminal counts, including drunken driving, battery to law enforcement, fleeing and criminal mischief.

In February 2004, Tkachik was charged again with possession of marijuana, police records state.

"Like anybody, he's made bad choices, but who hasn't," Nicholas Tkachik said of his brother. "He's definitely had the worst luck I've ever seen in my life."

The brothers grew closer after their parents' death, Nicholas Tkachik said.

"He's always been there for me when I needed him," he said. "He has a big heart."

View aerial footage as authorities searched in LaPorte County for the body of Jada Justice.

View locations in the search for 2-year-old Jada Justice

View Jada Justice is missing in a larger map