The family of singer Sean Levert has asked that the FBI get involved in the investigation of his death following an episode at Ohio's Cuyahoga County jail.

Warden Kevin McDonough had described Levert as "out of control," "hallucinating" and pounding on his cell door right before guards placed him in a restraining chair. But Levert's cousin, Michael Gibson, said he never had any such outburst, according to the Associated Press. 

The 39-year-old Levert died Sunday night at Cleveland's Lutheran Hospital after collapsing at the county jail, where he was serving a 22-month sentence for failure to pay child support.      

An autopsy did not determine the cause of death. Toxicology tests are expected to take weeks.      

FBI spokesman Scott Wilson says agents would meet with Levert's family.

Meanwhile, TMZ.com is reporting that Levert's body is being held at the Coroner's office longer than usual as his wife tries to decide whether to hold a private or public service.