An Indiana man convicted of raping and killing a 10-year-old neighborhood girl, then slaying his wife and three young daughters, has died in prison of an apparent suicide.

Simon Rios of Fort Wayne was found hanging in his cell at the Pendleton Correctional Facility Thursday morning. Prison spokesman David Barr says Rios was pronounced dead after medical personnel couldn't revive him.

The 36-year-old had been serving five life terms for the 2005 deaths.

Rios pleaded guilty in 2007 to abducting the neighbor girl near her school bus stop, driving her to a gravel pit and sexually assaulting and killing her. Days later, he killed his wife and three young daughters.

An autopsy is planned.