MIAMI, FL (WTAQ) - Two private investigators say they’re getting enough evidence to charge a former escort service operator with the death of a UW La Crosse student in Florida.

21-year-old Julia Sumnicht, a junior from Green Bay, died in March of last year while on spring-break in Miami Beach.

Private investigators Christopher Catania and Walter Philbrick have told the La Crosse Tribune that Sumnicht overdosed on the date-rape drug GHB – and convicted escort operator Jason Itzler served it in a drink without her knowing it.

Itzler has called himself the “King of Pimps.” He was convicted in 2005 of running a high-profile escort operation in New York. And he’s currently charged in New York with 11 unrelated charges involving drugs, prostitution, and money laundering. He has pleaded innocent.

Catania and Philbrick say they’ve been working with police in Miami Beach to round up evidence that could lead to charges in Sumnicht’s death.

Catania says he won’t give up on the case until it’s resolved. Police in Miami Beach and New York have not commented on the matter.

The investigators said Sumnicht met Itzler’s roommate about a year before she died – and they all went to Itzler’s apartment last March after a night of partying.