A convicted sexual predator with a history of targeting and drugging young aboriginal girls has been charged with criminal negligence in connection with two deaths in B.C.

Martin Tremblay, 45, was charged Wednesday with two counts each of criminal negligence causing death, obstructing justice and failing to perform his legal duties to provide necessaries.

Crown prosecutors and police would not confirm the circumstances behind the new charges, but the offences date back to March 2010 and were allegedly committed in Richmond and Burnaby.

Those particulars match up with the deaths of teenagers Martha Hernandez and Kayla LaLonde, who both overdosed on a lethal mixture of alcohol and drugs. Hernandez died in Tremblay's Richmond home, while LaLonde died in Burnaby.

He has denied any involvement in the girls' deaths and says he did not supply them with drugs.

Tremblay was also charged this fall with a number of sex-related offences involving four teenage girls. He was arrested in September immediately after his release from the Ford Mountain Correctional Centre, where he was serving an 11-month sentence for sex assaults in the Downtown Eastside.

Tremblay has a long history of sexual offences, and was convicted in 2003 on five counts of sexual assault against young girls. His victims said he drugged them and then filmed them having sex with him.

He was released from prison after serving just a year of that sentence, and was not bound by conditions to stay away from young girls.

Women's advocates have complained that not enough was done to protect the public after his release.