Investigators have yet to identify the cause of death of a 2-year-old boy whose badly decomposed remains were found Wednesday night near the Huey P. Long Bridge, Jefferson Parish Deputy Coroner Granville Morse said.

Morse said an autopsy conducted Thursday morning did not establish a definitive cause of death for the child.

The child’s remains were found in a garbage bag on the East Bank levee beneath the bridge. He appeared to have been dead roughly two weeks, Morse said.

Neither the Coroner’s Office nor the Jefferson Parish Sheriff’s Office has named the child or his parents, who deputies said were both questioned after the discovery of the body.

Jail records indicated that two people, Gabrielle Whittington and Onterio Thompson, were arrested in Jefferson Parish on Thursday on counts of unlawful disposal of remains and obstruction of justice. But the records did not detail Whittington and Thompson’s possible connection to the case.

Thompson also was booked as a fugitive from Kenner, according to jail records.

The investigation into the boy’s death began late Tuesday evening when his grandmother contacted the St. Tammany Parish Sheriff’s Office asking deputies to check on the boy, whom she had not seen for several weeks.

“The family members became suspicious when there were different stories about where this 2-year-old was located. We met with the family members and the mother. We got the runaround from the mother, who gave us different stories,” St. Tammany Parish Sheriff Randy Smith said.

The boy’s father was initially uncooperative, according to Smith. But he said the Marrero man ultimately led authorities to the body about 8 p.m. Wednesday.

Jefferson Parish Sheriff’s Office detectives are leading the investigation. A spokesman for the office declined to comment on the case, including whether either parent is facing charges.

Meg Farris, of WWL-TV, contributed to this report.

Follow Matt Sledge on Twitter, @mgsledge.

msledge@theadvocate.com | (504) 636-7432