A former girlfriend of Jonathan Duhamel is amoung four people who have been arrested in connection with the home invasion robbery of the poker champion last week near Montreal.

Three people were arrested earlier in the week, and Longueuil police made the latest arrest of a 20-year-old man on Thursday morning.

Duhamel's agent confirmed to The Canadian Press that the woman was someone the poker player dated over a short period and is the only person among the accused his client actually knew.

Duhamel was the first Canadian to win the World Series of Poker’s main event in Las Vegas in 2010, earning him $8.9 million US.

On Dec. 21, police say Duhamel was beaten and robbed after the suspects rang the doorbell of his home in Boucherville, Que.

Police say the suspects pushed their way in and later fled with money, a Rolex watch and Duhamel’s World Series of Poker championship bracelet.

The watch has now been recovered, police said, but the bracelet is still missing. They did not comment on if any cash was recovered.

"Investigators received information from the public and with this information they were able to arrest a 20-year-old woman Saturday night," said Const. Mark David of the Longueuil police.

She was charged with five offences including conspiracy.

Then on Monday a 22-year-old man and a 26-year-old man were arrested in Pointe-Claire in connection to the case. They appeared in court Wednesday charged with breaking and entering, robbery, assault and forcible confinement.

As of Thursday morning, no charges had been laid against the 20-year-old.  

"Investigators are still questioning the fourth suspect to find out who did what in this case," David said.

Duhamel was treated in hospital for minor injuries after the brazen robbery. In a statement released last week, he said he feared for his life during the ordeal.

The poker champ offered up a reward of up to $10,000 for the arrest of those responsible and the return of his property.

David said he couldn’t comment on if that reward has been claimed.

The investigation is still ongoing and investigators are asking anyone with information to contact the Longueuil police.

with files from Canadian Press