OKLAHOMA CITY — A hearing for a former Marine charged in the deaths of a prostitute featured on the HBO reality series “Cathouse” and three other people has been delayed.

Oklahoma County District Judge Glenn Jones on Wednesday agreed defense attorney Mitch Solomon’s request and delayed until March 30 the pretrial conference for David Allen Tyner. No reason for the delay was given.

Tyner is charged with six counts of first-degree murder in the Nov. 9, 2009, deaths of 22-year-old Brooke Phillips — who worked at the Moonlite Bunny Ranch brothel near Carson City, Nev., that was featured on HBO. He’s also charged with the deaths of Jennifer Ermey, Mark Barrientos and Milagrous Barrera and with the deaths of two fetuses because Phillips and Barrera were pregnant.

Tyner has pleaded not guilty.