CHICAGO, Illinois (CNN) -- A man suspected of murdering a doctor in Chicago, Illinois, is trying to skirt the U.S. justice system by fleeing to the French island territory of St. Martin, according to prosecutors. 

Dr. David Cornbleet, a dermatologist, was murdered in his Chicago office in October, 2006. 

"He's doing everything possible to protect himself," said Bernie Murray, chief of criminal prosecution for the Cook County State's Attorney's Office in Illinois. "At the end of the day, he's making a mockery of both French law and United States law." 

After fleeing to St. Martin, Hans Peterson, 29, turned himself in to French authorities and allegedly confessed to murdering Dr. David Cornbleet in October, 2006. Jon Cornbleet, Dr. Cornbleet's son, said he has seen a four-page confession in which Peterson admits to attacking and killing David Cornbleet in his Chicago office. 

Despite the alleged confession, Peterson is beyond the reach of U.S. law enforcement. As a French national on French soil, he cannot be sent to the United States for trial, according to a 2002 extradition treaty between the two countries. The United States, by contrast, is allowed to extradite U.S. citizens to France, under the treaty. 

U.S. Sens. Barack Obama and Dick Durbin, both of Illinois, sent letters to Secretary of State Condoleezza Rice asking for help extraditing Peterson. In response to the senators, the State Department wrote it "will continue to make every effort with the government of France to see that justice is served in this case." 

Sens. Durbin and Obama also wrote the French government requesting extradition. 
Who was murdered?
Where?
What kind of doctor is he?
When did this occur?
Was he caught?
Where is he?
Who is the suspect?
Is he French?
Will they send him to the U.S.?
Why not?
What does the treaty say?
Does this work both ways?
Did he do it?
How do they know?
To who?
What do experts think about this?
Who said that?
What does he do?
Is there anything that can be done?
Is anyone else trying to help?
Who?
Dr. David Cornbleet
Dr. David Cornbleet
in his Chicago office
in his Chicago office
dermatologist
dermatologist
October, 2006
October, 2006
No
After fleeing to St. Martin, Hans Peterson
fleeing to St. Martin
fleeing to St. Martin
Hans Peterson
Hans Peterson
Yes
French national 
No
cannot be sent to the United States for trial
2002 extradition treaty
2002 extradition treaty
French national on French soil, he cannot be sent to the United States for trial
French national on French soil, he cannot be sent to the United States for trial
No
The United States, by contrast, is allowed to extradite U.S. citizens to France
Yes
allegedly confessed
allegedly confessed
allegedly confessed 
French authorities
French authorities 
he's making a mockery of both French law and United States law
he's making a mockery of both French law and United States law
Bernie Murray
Bernie Murray
chief of criminal prosecution for the Cook County State's Attorney's Office
chief of criminal prosecution for the Cook County State's Attorney's Office
the State Department wrote it "will continue to make every effort
the State Department wrote it "will continue to make every effort
Yes
Sens. Durbin and Obama
U.S. Sens. Barack Obama and Dick Durbin
U.S. Sens. Barack Obama and Dick Durbin