The woman who killed a Calgary teen by pushing him into a moving CTrain is wanted by police again.

Natalie Pasqua failed to show up for a court appearance on assault charges and a warrant has been issued for her arrest.

Pasqua was convicted of manslaughter after pushing 17-year-old Gage Prevost in between the cars of a moving train in 2007.

Gage’s father, Dale Prevost, says he was sickened when he learned his son’s killer was back in trouble with the law.

In a conversation with CTV Calgary, Dale Prevost says his family doesn’t feel protected by the justice system and he fears for the safety of others.

“It’s just so disheartening to know what she’s put this family through,” said Dale.

Aug 1, 2014 will be the seven year anniversary of Gage’s death.

Pasqua has continued to have brushes with the law since her release.

Anyone with information about Pasqua’s current whereabouts is asked to contact the Calgary Police Service, 403-266-1234, or Crime Stoppers.