Vancouver women's advocates say B.C.'s Crown prosecutors didn't do enough to protect the public from Martin Tremblay, a convicted sex offender who was living unmonitored in a house where a teenage girl died last month.

Tremblay's picture was posted on every pole at Broadway and Commercial Drive on Thursday. Summer-Rain Bentham of the Vancouver Rape Relief and Women's Shelter says the 44-year-old frequents the neighbourhood.

"It is a known location where he does come to pick up young girls," Bentham said.

The poster warns that Tremblay, also known as "Frenchie," has a history of drugging and sexually assaulting teenagers. Bentham questions why police haven't issued a public warning about him.

"His behaviour is continuing, and hasn't stopped since his conviction," she said.

Tremblay was convicted in 2003 of five counts of sexual assault. He was released after serving just over a year in prison, with no condition that he keep away from young girls.

On March 2, 17-year-old Martha Hernandez was found dead in Tremblay's Richmond home. Her friend Kayla LaLonde died in Burnaby the same day. Police say both girls were killed by a lethal mix of drugs and alcohol.

Crown spokesman Neil Mackenzie said prosecutors decided on a fixed-sentence instead of ongoing supervision.

"The Crown has the ability in appropriate cases to seek a long-term offender designation," Neil Mackenzie said.

"In this case, upon reviewing the circumstances, Crown believed the appropriate position was to ask for a fixed sentence."

Law professor Janine Benedet doesn't understand why Crown counsel didn't apply to put him on the sex offender registry, or at least seek long-term supervision.

"Multiple victims; took advantage of them while they were incapacitated; and made child pornography of it," Benedet said.

"If that doesn't fit the profile of a long-term offender who needs close supervision in the community it's hard to imagine who does."

With a report from CTV British Columbia's Lisa Rossington