timeline here of their crime spree - too much to copy here - except for the last paragraph:
Panama's Deputy Attorney General Angel Calderon
"If anyone has any information which could potentially lead us to other
possible victims, I would ask those people to please come forward with
that information immediately."If you know of anyone who just went missing
one day, and the next day their property is all of a sudden "owned" by
"Wild Bill" and Jane Cortez, then please let the authorities know. There
are reportedly dozens of members of the community of English speaking
expatriates missing in Costa Rica who have never been found. That's why
"Wild Bill" and Jane Cortez could live as millionaires.
Panamanian officials are continuing to dig for victims.
Authorities expect the number of murder victims could to rise to as many as 20.
Holbert has only confessed to 5.
Source: SERIAL KILLER(S) WILLIAM HOLBERT & LAURA MICHELLE REESE PREYED ON EXPATS & LOCALS IN COSTA RICA & PANAMA
Some quotes from above article:
"You know that HBO show The Sopranos?
He wanted to be Tony Soprano for a while — he's got that mindset."
Holbert's method of killing victims remniscent of Genickschuss: German for "a shot to the nape of the neck." It comes from the German concentration camps in WWII.
In another "homage" to his hero Hitler, Holbert removed the fillings from his
victim's teeth.
" It appears that William Holbert, alias "Wild Bill", even tore out his victim's gold fillings, according to evidence found yesterday, Wednesday, at his house located in the community of Aguacate in the area of Tierra Oscura, in Bocas del Toro, where five bodies were found buried. The officials could not mask their expressions of surprise and disgust when they found a glass jar containing pieces of gold teeth. By their condition, apparently they were extracted while the victims were still alive."