New Orleans police arrested a man Friday for allegedly withholding information from detectives investigating the murders of Lakeitha and Kenneth Joseph, the Reserve couple who were bound with blue rope and dumped into the Intracoastal Waterway in New Orleans East.

Steven Bradley, 28, was booked with one count of obstruction of justice after “an extensive investigation,” said Officer Frank Robertson, a Police Department spokesman. Police did not reveal what information Bradley is accused of withholding.

Superintendent Ronal Serpas issued a statement saying there are still “people out there who have information regarding this murder.”

“We would urge them to come forward and speak to our detectives,” Serpas added. “Should they choose to continue to attempt to protect those responsible for these murders, we will aggressively pursue them to the full extent of the law.”

The arrest of Bradley brings to four the number of people booked in the February deaths of the Josephs, who detectives believe were weighted down with 30-pound kettlebells. Last week, Brittany Martin, 25, and Horatio Johnson, a 37-year-old cousin of Kenneth Joseph, turned themselves in to face second-degree murder charges in the case.

Martin, accused by Serpas of buying “the murder weapon,” was caught on surveillance camera buying two kettlebells, blue utility rope and other materials at a Kenner Walmart store. Detectives believe the purchases were related to the killings.

Police have said Martin and Johnson also delivered a van taken from the Josephs to another person to be destroyed.

Federal authorities earlier arrested Frank Mike Jr., a man who has allegedly admitted driving the Josephs’ van to Atlanta and abandoning it there after the killings. He was indicted by a federal grand jury on a charge of interstate transportation of a stolen motor vehicle

The latest man arrested, Bradley, has prior convictions for attempted armed robbery, distribution of cocaine, distribution of ecstasy and attempted felony theft, police said.