Gilgo Beach serial killer suspect Rex Heuermann appears in court

RIVERHEAD, N.Y. -- Accused Gilgo Beach serial killer Rex Heuermann made a brief appearance in court Tuesday as prosecutors turned more discovery over to the defense team. 

Heuermann's estranged wife Asa Ellerup was also in court, with a support service dog and an attorney, but she did not speak. 

So far, Heuermann has been charged in the murders of six women. He's a suspect in a seventh case. 

He's due back in court in October. 

Heuermann was arrested a little more than a year ago and charged with three Gilgo Beach murders. He has since been charged with three more. 

Ellerup's attorney has said Heuermann is the main suspect in a seventh murder. 

Heuermann has pleaded not guilty to the killings. 

The Gilgo Beach killings took place from the early 1990s until 2011.